高温小井眼长水平段钻井液技术

吉林油田英台气田营城组裂缝性火山岩富含天然气,埋藏深,储层温度最高达140℃。该区块部署的评价井龙深1平1井属小井眼长水平段水平井,完钻井深为4 048 m,1 122 m的小井眼长水平段钻进摩擦阻力大,环空压耗大、返速低,携屑难度大,钻井周期长,易引起井下复杂情况。因此,优选出了表面活性剂,可改善钻井液的润滑防卡能力、储层保护能力和稳定井壁能力。最终形成的抗高温聚合物钻井液在高温条件下具有较好的流变性能、润滑性能、抑制能力和储层保护效果,携屑能力强,滤失量小,满足龙深1平1井优快施工需求,实现了吉林油田深层水平井水平段最长记录。

Drilling Fluid Technology of Well LongshenlHl

Gas exists richly in fractured volcanic rock of the Yingcheng group in Yingtai gas field of Jilin oilfield, and thereservoir is deep with the highest temperature of 140℃. The well LongshenlHl, located in this block, is drilled withsome difficulties, such as long small horizontal section hole of 1,122 m with the finish drilled depth 4,048 m, big friction,high annulus pressure loss, low return velocity, hard carrying cuttings, long drilling period and many complex situations.Consequently, a kind of surfactant is optimized to improve lubricity, protect reservoirs and make wellbore stable. Theapplication of this drilling fluid system with the surfactant shows that it can satisfy the demand of fast drilling of wellLongshenlHl, which makes a record of the longest horizontal section well in Jilin oilfield.