胜利油田草南地区水平井钻井液技术  

Horizontal well drilling fluid technology in Caonan area of Shengli Oilfield

作　　者：董明鉴[1] 石学强[1] 丁海峰[1] 

机构地区：[1]胜利油田钻井三公司

出　　处：《钻井液与完井液》2002年第2期46-47,共2页Drilling Fluid & Completion Fluid

摘　　要：水平井钻井液要解决的主要问题是防粘卡和防沉砂卡钻。在聚合物乳化钻井液的基础上加入主处理剂MMH和FTJN,形成了一种新型钻井液体系。钻井液配方为(2％-3％)MMH+(2％-3％)FTJN+(2％-3％)SMP+(10％-15％)原油+(0.5％-0.8％)SN-1+(0.3％-0.5％)PHP+2％MRX。在一开和二开的直井段以MMH和FTJN为主处理剂,配合使用聚合物,控制粘土造浆,抑制粘土分散,达到井眼稳定的目的;斜井段为解决裸眼水平井摩阻大的问题,用MMH和FTJN处理钻井液并混入原油,定向后,使原油含量达到10％-15％,SN-1固体乳化剂含量达到0.5％左右,以提高泥饼质量,增强钻井液的润滑性,防止粘卡事故的发生;井斜超过45°后,使混油量达到12％左右,严格控制钻井液的流变性,特别是动切力和10 s静切力,保证摩阻系数小于0.05;钻进砾石层时,钻速较快,砾石颗粒较大,为了防止沉砂卡钻,控制密度为1.14-1.16 g/cm3,动塑比为0.8-1.0 Pa/mPa·s,塑性粘度大于10 mPa·s,动切力大于8 Pa。应用结果表明,以MMH和FTJN为主处理剂的聚合物乳化钻井液具有较好的防塌性能、抑制性能及较强的携岩能力,钻井速度快,井眼清洁,施工过程中未出现任何井下复杂情况,满足了草南地区水平井钻井及完井要求。Stuck pipe because of pressure differential and sand setting is one of the main problems in horizontal well drilling. A new drilling fluid system is developed to solve this problem, by adding mixed metal hydrate (MMH) and shale control additive (FTJN) in the polymer mud. MMH and FTJN are used as the main additives in the polymer system to control mud making and clay dispersion in the upper vertical hole. In the inclined hole, crude oil is mixed into to overcome the high friction in horizontal well, and its content is increased up to 10%-15% after orientation, and emulsifier SN-1 of 0. 5% to improve mud cake and drilling fluid lubricity. When the hole inclination is over 45°of degree, crude oil content reaches up to 12% , and strictly control the rheology, especially dynamic and static shearing force, and control the friction coefficient within 0. 05. When drilling the congolmerate formation, drilling parameters must be strictly controlled to avoid sand setting and pipe stuck, e. g. , mud density of 1. 14-1.16 g/cm3, dynamic plastic ratio of 0. 8-1. 0 Pa/mPa·s, plastic viscosity of 10 mPa·s, and dynamic shearing force of over 8 Pa. Practicing results show that the polymer drilling fluid system, treated by MMH and FTJN has good shale control and cuttings transportation ability, it improves drilling speed and hole cleaning efficiency, and nodownhole troubles have been encountered.

关 键 词：胜利油田 草南地区 水平井 钻井液技术 聚合物钻井液 钻井液添加剂 润滑防卡 井眼稳定 

分 类 号：TE254.3[石油与天然气工程—油气井工程]