摘要
针对含硫井修井作业中使用碱液污染地层以及其它除硫剂与地层不配伍的难题,研发了一种以天然矿物作除硫剂的无固相洗井液体系。该体系利用过硼酸盐的弱氧化还原反应根除体系中的硫,复配使用了一种p H值保持剂,其抗钙镁消耗能力强,在消耗硫化氢的同时,可给体系提供适宜的碱性环境,防止硫化氢的二次析出;过硼酸盐和p H值保持剂均具有一定的水溶性。该洗井液的硫化氢吸收量达到了237.33 mg/L,腐蚀率仅为0.005 6 mm/a,且抗消耗能力强,具有低碱度、低腐蚀、不结垢,与地层水和储层岩石的配伍性好,防膨率达90%,具有良好的返排能腐蚀率仅为0.005 6 mm/a,且抗消耗能力强,与氯化钾具有协同增效作用,抗钙达到10 000 mg/L。该体系在大港油田先导性应用5口井,平均恢复期为2 d,油层保护效果显著。
Two sets of solids-free workover fluids were formulated with natural mineral sulfide scavenger.The adsorption rates of sulfide hydrogen of the workover fluids were as high as 237.33 mg/L.They also had low alkalinity,low corrosivity,did not form scale and were compatible with calcium and magnesium ions,and formation waters.Being solids-free,they posed no damage to reservoirs.Pilot application of the workover fluids in five wells in Dagang Oilfield was successful,average restoration period of these wells was2 days,and the reservoir formation was proved not damaged by the workover fluids.
出处
《钻井液与完井液》
CAS
北大核心
2015年第2期23-25,98-99,共3页
Drilling Fluid & Completion Fluid
基金
大港油田石油工程研究院课题"生产作业中油层保护技术深化技术研究与应用"(20140206)
关键词
无固相低伤害洗井液
防硫化氢
碱液
恢复期
Solids-free
Hydrogen sulfide scavenge
Low damage
Well flushing fluid
Alkaline fluid
Restoration period
