二氧化氯解堵技术

针对老油田长期开采后,多数油水井均出现产量和注水量下降的现象,利用二氧化氯解堵技术解除压裂液、钻井液滤液中有机高分子堵塞、去除铁垢、杀死细菌达到解堵的目的.对二氧化氯的物理性能、解堵原理研究表明,二氧化氯是一种强氧化剂,可以有效解除油井的细菌、铁硫化物及聚合物的腐蚀及堵塞.二氧化氯解堵技术主要适用地层存在垢堵、乳化堵、压裂液损害、聚合物堵塞、细菌、FeS堵塞等有机无机复合堵塞;地层能量较高,物性较好;堵塞原因复杂,常规措施无效.现场应用表明,二氧化氯能有效地控制油田污水中的细菌,其他水质指标则受影响较小;二氧化氯能氧化分解铁硫化物,使油井恢复生产,并对原油性质影响小.介绍了二氧化氯解堵工艺,同时提出了二氧化氯解堵技术存在的问题.

Chlorine dioxide plugging relief technology

In mature oilfield, both oil yield and water injection rate appear in most oil/gas wells after a long time production. Chlorine dioxide plugging relief technology is determined to decompose high molecule polymer, eliminate iron setting and kill bacilli to release damage to formation. Physical property and its plugging relief mechanism of chlorine dioxide were investigated, and results showed that chlorine dioxide is a strong oxidizer to remove plugging produced by bacilli, ferrite sulfide and polymer effectively. The technology is also fitful to be employed in formations as follows: 1) formation damaged by scale setting, emulsion blocking, fracturing fluid and other inorganic/ organic plugging; 2) formation of high energy and high stability; 3) formation in complex damaged style, and the conventional measures are not qualified. In -situ application indicated that chlorine dioxide suppressed bacteria growing effectively and it has little effect on other issues of water quality; it decomposes ferric/sulfide compound, which is good for recovery of oil well. The plugging relief technology is introduced in this paper. At the same time, problems existing are put forward as well.