Hole cleaning evaluation and installation spacing optimization of cuttings bed remover in extended-reach drilling  

作　　者：Shuo Peng Wen-Jun Huang De-Li Gao 

机构地区：[1]MOE Key Laboratory of Petroleum Engineering,China University of Petroleum-Beijing,Beijing,102249,China [2]State Key Laboratory of Petroleum Resources and Engineering,China University of Petroleum-Beijing,Beijing,102249,China

出　　处：《Petroleum Science》2024年第3期2005-2022,共18页石油科学（英文版）

基　　金：the financial support from the Natural Science Foundation of China(Grant Nos.52222401,52234002,52394250,52394255);Science Foundation of China University of Petroleum,Beijing(Grant No.ZXZX20230083);other projects(ZLZX2020-01-07-01)。

摘　　要：In extended-reach or long-horizontal drilling,cuttings usually deposit at the bottom of the annulus.Once cuttings accumulate to a certain thickness,complex problems such as excessive torque and drag,tubing buckling,and pipe stuck probably occur,which results in a lot of non-productive time and remedial operations.Cuttings bed remover can efficiently destroy deposited cuttings in time through hydraulic and mechanical stirring effects.This paper aims to build a method for hole cleaning evaluation and installation spacing optimization of cuttings bed remover to improve the wellbore cleaning effect.Firstly,a Computational Fluid Dynamics approach with Eulerian—Eulerian multiphase model was utilized to investigate the mechanism of cuttings transportation,and a new type of cuttings bed remover was designed.Next,an evaluation method of hole cleaning effect of remover was established.After that,the effects of several drilling parameters on hole cleaning including flow rate of drilling fluid,rotational speed of drillpipe,rate of penetration,wellbore size,rheological property of drilling fluid,and remover eccentricity on the performance of cuttings bed remover were investigated.The results demonstrate that the new type of remover with streamline blade performs better than conventional removers.The efficiency of hole cleaning is greatly improved by increasing the rotational speed of drillpipe,flow rate of drilling fluid,remover eccentricity,and 6 rpm Fann dial reading for drilling fluid.While higher rate of penetration and large wellbore size result in worse hole cleaning.These findings can serve as an important guide for the structure optimization design of cuttings bed remover and installation spacing of removers.

关 键 词：Extended-reach drlling Drilling hydraulics Cuttings transport Hole cleaning Cuttings bed remover 

分 类 号：TE92[石油与天然气工程—石油机械设备]