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注水开发油田,油水井堵水调剖是一种常用的降低高渗透层渗透率,提高注入水波及程度,从而提高原油采收率的方法。这里介绍一种新的堵水调剖法——热沉淀法。该方法是向油水井封堵层注入一种热饱和(或近饱和)的化学剂溶液,溶液中的化学剂在地层温度下的溶解度较注入高温下的溶解度要低得多,所以溶液注入达到设计层位冷却后,化学剂就从注入溶液中沉淀析出,导致孔隙空间缩小,渗透率降低。实际施工中,可
Waterflooding oilfields and water wells The water plugging and profile control is a commonly used method to reduce the permeability of high permeable beds, increase the inflow of water and improve the recovery rate of crude oil. Here’s a new plugging water profile method - thermal precipitation method. The method is to inject a hot-saturated (or nearly saturated) chemical solution into the plugging layer of the oil-water well. The chemical solution in the solution has a much lower solubility at the formation temperature than that at the high temperature. Therefore, the solution injection reaches After the design bed is cooled, the chemical precipitates from the injected solution, causing the pore space to shrink and the permeability to decrease. In actual construction, may