钻井液与完井液2017，Vol.34Issue(1)：28-32,5.DOI:10.3696/j.issn.1001-5620.2017.01.005
疏水抑制水基钻井液体系研究及其在页岩气井的应用
Study of Hydrophobic Inhibitive Water Base Drilling Fluid System and Application in Shale Gas Well
摘要
Abstract
A hydrophilically inhibitive water base drilling fluid has been developed to drill shale gas wells penetrating the Longmaxi Formation.This drilling fluid was formulated with a hydrophilically inhibitive agent CQ-SIA and a high performance lubricant CQLSA.CQ-SIA,the core additive of the formulation,is amphoteric in nature,and can render wettability reversal to the surface of rocks.It forms on the surface of rocks a hydrophilic film,thereby encapsulating and inhibiting the rocks from disintegration by water invasion.Hot rolling test results showed that 1％ CQ-SIA gave percent cuttings recovery of 83.72％,remarkably higher than that obtained with KPAM,AP-1 and KCl.CQ-LSA,thanks for its special molecular groups and structure,can form lipophilic film on the hydrophilic surfaces of drilling tools,mud cakes and formation rocks,thereby greatly decreasing frictional resistance experienced in drilling.Sticking coefficient of a 5％ bentonite slurry treated with 1％ CQ-LSA was 0.0507,lower than the 5％ bentonite slurries treated with two commonly used lubricants RH-220 and BARALUBE.The formulated drilling fluid had good rheology,high inhibitive capacity and good lubricity that were equivalent to oil base drilling fluid.Addition of 1％-3％ anti-sloughing plugging agent,1％-2％ poly glycol and 0.8％-1.6％ nano plugging agent rendered the formulation good plugging performance.It also had good contamination resistance.Success has been gained in the first use of this formulated drilling fluid on the well Changning H25-8.Mud properties in the horizontal fourth interval (3,079 m open hole length and 1,500 m horizontal section) were all maintained stable.No downhole problems have ever occurred.Tripping,wireline logging,casing running and well cementing were all done smoothly.关键词
页岩气水平井/水基钻井液/井眼稳定/封堵性/疏水/润滑剂Key words
Horizontal shale gas well/Water base drilling fluid/Borehole wall stabilization/Plugging performance/Hydrophilic/Lubricant分类
能源科技引用本文复制引用
景岷嘉,陶怀志,袁志平..疏水抑制水基钻井液体系研究及其在页岩气井的应用[J].钻井液与完井液,2017,34(1):28-32,5.基金项目
国家科技重大专项课题“页岩气水平井水基钻井液研究与试验”(2016ZX05022-001-002) （2016ZX05022-001-002）
