油基钻井液体系在东海气田的试验应用
发布时间：2018-10-10 13:16
【摘要】：东海地区油气层系主要分布在花港组和平湖组,存在砂泥岩互层胶结疏松、裂缝性泥岩以及煤层发育等地层特性,井壁稳定和井眼清洁是导致钻井复杂情况的主要原因。研究气田的大位移井最大井深为6 716 m,最大水平位移达4686 m,垂深最大为4 429 m,井底温度最高在150℃以上,井口返出钻井液温度在115℃以上。大井斜、高水垂比和长水平位移,使井眼清洁难度更大;地层温度高,使设备维护难度大。为满足该气田大位移井安全高效作业要求,建立了一套低黏高切的油包水钻井液体系,并加入了2%封堵剂PF-MOLSF、2%成膜封堵剂PF-MOLPF和2%~3%疏水胶体封堵剂PF-MOHCP。在现场应用中,通过调节提切剂PF-HSV-4加量,该油基钻井液表现出了很好的携岩性,井眼净化效果好;在地层稳定性差的井段增加成膜封堵剂的加量,7口井没有发生漏失,井下事故率为零,个别井段遇阻均划眼通过,划眼时间相比探井减少70%以上,其他作业都安全顺利;钻井液在储层段的高温高压滤失量均在3 m L以内,且滤失的几乎全为油相,对储层液损程度小,避免了水敏等伤害。室内评价和现场应用结果表明,该油基钻井液具有良好的流变性、电稳定性和润滑性,井壁稳定和储层保护效果明显,加上钻井液维护及油基岩屑处理等配套措施的完善,使其在东海的应用获得了成功。
[Abstract]:The oil and gas strata in East China Sea are mainly distributed in Huagang formation and Pinghu formation. There are some stratigraphic characteristics such as loose cementation of sand and mudstone, fractured mudstone and the development of coal seam. The stability of wellbore and the cleaning of borehole are the main causes of complicated drilling. The maximum well depth, horizontal displacement, vertical depth and bottom hole temperature are 6 716 m, 4686 m, 4 429 m, 150 鈩，
本文编号：2261917
[Abstract]:The oil and gas strata in East China Sea are mainly distributed in Huagang formation and Pinghu formation. There are some stratigraphic characteristics such as loose cementation of sand and mudstone, fractured mudstone and the development of coal seam. The stability of wellbore and the cleaning of borehole are the main causes of complicated drilling. The maximum well depth, horizontal displacement, vertical depth and bottom hole temperature are 6 716 m, 4686 m, 4 429 m, 150 鈩，
本文编号：2261917
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