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環(huán)保型PRD鉆開液的性能研究

Study on Performance of Environment-friendly PRD Drilling-in Fluid

  • 摘要: 針對大位移井和水平井儲層段存在攜帶鉆屑及起下鉆困難等問題，研制了一種井眼清潔能力強的環(huán)保型PRD鉆開液。該鉆開液主要處理劑是極易生物降解的天然高分子聚合物。PRD鉆開液的BOD5/CODCr為0.42；溶解氧(DO)衰減法評價結(jié)果表明，PF-VIS及PF-FLO兩種天然高分子聚合物易生物降解；PRD鉆開液生物毒性檢驗結(jié)果符合一級海區(qū)生物毒性允許值要求；LSRV(低剪切速率黏度)高達60 000 mPa·s，攜帶及懸浮鉆屑能力很強，不會形成巖屑床，巖心滲透率恢復值在90%以上，對儲層傷害很小。該鉆開液用在我國渤海、東海、南海西部、南海東部及新疆等油田，油氣產(chǎn)量有較大提高。

     

    Abstract: A kind of environmental-friendly water base drilling fluid, PRD drilling-in fluid, was developed to deal with tripping difficulty and carrying cuttings in extended reach wells and horizontal wells. PRD drilling-in fluid composes of several highly biodegradable natural high polymer additives. The BOD5/CODCr ratio of PRD system is 0.42. The dissolved oxygen decay evaluation showed that the two natural polymers, PF-VIS and PF-FLO were readily biodegradable, and PRD drilling-in fluid’s biological toxicity test met the biological toxicity limit requirement for the first level seas. Low shear rate viscosity (LSRV) was up to 60 000 mPa?s so that the system could carry and suspend cuttings with no cuttings bed and the core return permeability was more than 90%, which caused tiny damage to reservoir. The PRD drilling-in fluid was successfully applied in Bohai Bay, East Sea, South Sea and Xinjiang Oilfield, with greater oil and gas production than other drilling fluids systems.

     

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