New Solids-free, Hydrogen Sulfide-Proof, Low Damage Workover Fluid Technology
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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pH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pH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0.0056 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0.0056 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10000 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。Abstract: 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 was 2 days, and the reservoir formation was proved not damaged by the workover fluids.
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Key words:
- Solids-free /
- Hydrogen sulfide scavenge /
- Low damage /
- Well flushing fluid
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