关键词: 水平井, 岩屑, 模式, 环形空间, 钻井液

Abstract: The paper gives theresults of an experimental study transport of cutting in a horizontalwell.Eight kinds of drilling fluids are used.The cross design method is used for test design.The effects of annular fluid velocity,drillpipe rotation,eccentricity between drillpipe andwellbore,drilling rate,mud rheological properties,mud density and cutting size on cuttingstransport are taken into accounts.Variables having the most and the least significant effectson cutting-bed size are presented,as well as the effects of cross coupling between parame-ters.A empirical model of cutting-bed thickness is developed.After verifying the model by u-tilizing drilling data of seven horizontal wells,two centimeters cuttingbed height is prefer-able in safe drilling.As a result,the logical annular velocity is gained.Combined with the pre-vious researches and on-site horizontal wells drilling experience,the paper recommends holecleaning measures for horizontal well drilling.

Key words: horizontal wells, cuttings, model, annular space, drilling fluid