小井眼提速钻井液体系

小井眼钻井由于自身特点如环空间隙小等,对钻井工艺和钻井液性能提出了更高的特殊要求,不断提高钻井速度是钻井作业的一直追求,其中钻井液的作用至关重要。通过室内实验,研究出了针对小井眼钻井提速的钻井液配方,优选出了适合小井眼提速钻井液体系的增黏剂PLUS+流型调节剂、降滤失剂HFL-X+SPNH、提速剂HDS以及用甲酸钠和重晶石联合加重的方式。提速剂HDS是室内研制的,其具有良好的防黏附聚结能力和降低亚微米颗粒含量的效果。结果表明,该小井眼提速钻井液具有良好的润滑性、抑制性以及提高钻井速度的效果。现场应用结果表明,小井眼钻井液可以较好控制循环当量密度,并且具有显著的提高机械钻速的效果,能够满足小井眼钻井的要求。 

Drilling Fluid Technology for ROP Enhancement in Slim Hole Drilling

Slim hole drilling,because of the narrow annulus,imposes more strict requirements on drilling engineering and drilling fluid.Drilling fluid plays an important role in fast drilling of slim holes.A drilling fluid formulation for slim hole drilling has been developed in laboratory,and drilling fluid additives suitable for slim hole drilling are engineered.These additives include viscosifier PLUS,flow pattern control agent,filter loss reducer HFL-X and SPNH,ROP enhancer HDS,and weighting material sodium formate used in combination with barite.HDS has been developed in laboratory for the preventing bit balling and reducing the content of submicron particles.HDS has good lubricity,inhibitive capacity and the ability to increase ROP.Field application has proved that this drilling fluid formulation controlled ECD fairly well and notably enhanced ROP,satisfying the needs for slim hole drilling.