隆页1HF页岩气井钻井关键技术

隆页1HF井是位于彭水区块的一口页岩气预探井,钻遇地层具有缝洞发育、倾角大、可钻性差等特点,钻井过程中面临易漏失、易井斜、页岩层易坍塌、机械钻速低等难点。通过综合应用近钻头地质导向钻井技术、油基钻井液、双凝双密度水泥浆等,并对井眼轨道、钻头和钻具组合进行优化设计,实现了安全、优快钻进。隆页1HF井全井未发生恶性漏失,大斜度井段机械钻速比相邻地区页岩气井提高32%,储层穿遇率达100%,钻井周期缩短25.68%,固井质量优秀。该井采用的钻井关键技术能够进一步降低彭水区块页岩气开发成本。 

Key Drilling Technologies for Shale Gas Well Longye 1HF

Well Longye 1HF is a shale gas wildcat well in the Pengshui block and its formations are characterized by well-developed fractures and pores, large dip angles and poor drillability, so the following technical difficulties tended to occur during its drilling, e.g. leakage, deflection, shale collapse and low ROP (rate of penetration). After the well trajectory, bits and drilling assembly were optimized, the drilling was performed safely and quickly by applying comprehensively near-bit geosteering drilling technique, oil-based drilling fluid and double coagulation-double density cement slurry. It was shown in Well Longye 1HF that no serious leakage occured in the whole well interval and its ROP at highly deviated well interval was 32% higher than those of the shale gas wells in its adjacent area. And furthermore, its reservoir penetrating ratio was up to 100%, drilling cycle was shortened by 25.68% and cementing quality was good. Based on these key drilling technologies adopted in this well, the development cost of shale gas in Pengshui Block could be reduced further.