水平井岩屑床清洁工具的设计与试验  

Design and test of a cuttings bed remover for horizontal wells

作　　者：纪国栋 汪海阁[1] 黄洪春 孟昭 崔柳 郭卫红 JI Guodong;WANG Haige;HUANG Hongchun;MENG Zhao;CUI Liu;GUO Weihong(CNPC Engineering Technology R&D Co.,Ltd.,Beijing 102206,China;PetroChina Research Institute of Petroleum Exploration&Development,Beijing 100083,China)

机构地区：[1]中国石油集团工程技术研究院有限公司 [2]中国石油勘探开发研究院

出　　处：《天然气工业》2021年第2期125-131,共7页Natural Gas Industry

基　　金：国家科技重大专项“工厂化钻井关键技术研究及应用”(编号:2016ZX05022-001);国家科技重大专项“页岩气三维丛式水平井优快钻井技术试验与应用”(编号:2016ZX05062003);中国石油天然气集团有限公司重大科学研究与技术开发项目“深井与水平井提速提效技术集成与示范”(编号:2018E-2108)。

摘　　要：页岩气井水平段钻进过程中的岩屑堆积是造成钻井摩阻扭矩大、托压严重进而影响钻井速度的主要原因之一,因而抑制岩屑床生成、保持井眼清洁是确保水平段安全顺利钻进的重要前提。为了提高水平井段井眼清洁的效率,应用CFD数值模拟方法、采用欧拉—欧拉双流体模型并结合颗粒动力学理论,对所研发的带有“V”形叶片的新型水平井岩屑床清洁工具的螺旋角、转速参数诱导螺旋流动衰减规律及对岩屑颗粒重新悬浮分布的影响等进行了研究,进而优选了叶片旋转速度、叶片螺旋角等关键参数。研究结果表明:①随着转速的增加,环空底部的岩屑沉积发生了一定程度的偏转,转速越大偏转越明显;②环空压降损失随着螺旋角的增加而增大,在螺旋角较大时该现象表现更为明显;③在四川盆地南部地区长宁H25-7井进行的现场试验结果表明,使用新型水平井岩屑床清洁工具后钻进摩阻下降33%,起下钻通畅、无阻卡,新工具应用过程中未发生井下复杂事故,发挥了良好的井眼清洁作用,保证了后期下套管作业的安全顺利实施。结论认为,该工具不仅可以满足水平井岩屑床的清洗及钻井降本增效的需求,具有良好的推广应用价值,而且还可以为同类型岩屑床清洁工具的设计提供借鉴与参考。Cuttings accumulation in horizontal drilling of a shale gas well is one of the main reasons for high drilling torque and drag and serious backing pressure and consequently influencing the rate of penetration(ROP),so inhibiting the generation of a cuttings bed and keeping the hole clean is an important prerequisite to ensure the smooth and safe drilling of horizontal section.In order to improve the hole cleaning efficiency of horizontal sections,this paper studied the decay laws of helical flow induced by helix angles and rotation speed of a newly developed cuttings bed remover with V-shaped blades for horizontal wells and their influences on the resuspension distribution of cuttings particles by virtue of the CFD numerical simulation method and Euler-Euler binary-fluid model,combined with the theory of particle dynamics.Then,the parameters such as blade rotation speed and blade helix angle were optimized.And the following research results were obtained.First,with the increase of the rotation speed,cuttings deposit at the bottom of the annulus deflects to a certain degree.And the higher the rotation speed,the more obvious the deflection.Second,annulus pressure drop loss increases with the increase of the helix angle.And this phenomenon is more obvious when the helix angle is larger.Third,the field test results in Well Changning H25-7 of the southern Sichuan Basin show that after the application of the newly developed cuttings bed remover for horizontal wells,the drilling friction is decreased by 33%,the tripping is smooth without sticking.And in the process of its application,no complex downhole accident happened.Obviously,it provides good hole cleaning to ensure the safe and smooth implementation of the later casing running operation.In conclusion,this newly developed cuttings bed remover can satisfy the demand of cutting bed cleaning and drilling cost reduction and efficiency improvement of horizontal wells,so it is worth popularizing and applying.What's more,it provides guidance and reference for the design of

关 键 词：页岩气 水平井 井眼清洁 “V”形叶片 岩屑床清洁工具 反螺旋叶片 CFD 

分 类 号：TE92[石油与天然气工程—石油机械设备]