柯柯亚致密砂岩气藏充氮气欠平衡钻完井技术

Oil Drilling & Production Technology(2010)

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Abstract
吐哈油田台北凹陷北部山前构造带柯柯亚区块致密砂岩气藏是吐哈油田发展战略目标的重点攻坚区块,常规钻井钻速低,探明储量和保护储层效果差。文中论述了采用充氮气欠平衡钻完井技术解决该区块钻井的问题,通过优化井身结构、钻具组合,优选钻头、钻井参数、氮气注入量,在确保井下安全的情况下最大程度地释放储层能量,起到了保护储层和探明储量的双重功效,同时避免了井漏,缩短了钻井周期。在柯21-2井进行了试验,机械钻速同比提高127.35%,欠平衡钻井点火成功21次,投产后采用φ8 mm油嘴试产,日产气约5×104 m3,效果较好,可进一步推广应用。
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Key words
reservoir preservation,gel valve,Kekeya,nitrogenation underbalanced drilling,tight sandstone gas
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