海上油田酸化酸液的选择及现场应用

针对海上油田地层疏松、孔隙度大、渗透率高、油层易出砂、完井多采用砾石充填等特点及造成地层污染的原因,采用低浓度复合酸作为酸化施工主处理液,这样既减少了对地层及充填砾石的损害,又保证了处理液对地层有适宜的、较高的溶蚀率,对解除钻井液和固井水泥浆造成的污染堵塞也有明显效果。海上油田酸化施工对环境保护有更高的要求,残酸需进一步处理,达到海洋环保标准要求后安全排放。经过酸液类型及浓度的确定、添加剂的筛选、流动模拟及残酸分析、处理等室内试验研究,确定了适用于海上酸化的酸液配方及泵注工艺,应用于渤海绥中 3 6- 1油田,取得了良好的酸化效果。

Selection and Application of Acid Fluid in Offshore Field

compound acid is used in accordance with the practical condition of pay zone at offshore Oilfield, such as high porosity and permeability, low bonding strength and gravel pacing. The compound acid has less damage and better suitable dissolving capacity to formation. It has remarkable effective on plug removing induced by drilling fluid and cement liquid too. According to demand of environment protection, there are many restrictions on acidizing at offshore field. The spend acid should be disposed before it is discharged. The compound acid is developed after experiment of selecting the type and concentration of acid, selecting additives and analyzing spend acid. Field testing at offshore Oilfield SZ36-1 are successful.