CAJ | 학술논문

对套管管端直线度测量方法进行了调查研究，认为目前测量套管管端直线度的直尺太重，测量方法不正确，实际测量结果是管端局部直线度，并非管端直线度。采用马鞍规测量管端直线度时，马鞍规支点位置的管体几何形状对测量精度有一定影响。通过对一批直连型套管接头偏心原因进行分析，认为套管接头偏心原因是管端弯曲所致，管端弯曲的原因是工厂管端直线度测量方法不正确，在加工螺纹接头之前未能发现管端弯曲。建议采用足够轻的直尺测量管端直线度，保证直尺至少有0．3 m（1英尺）与管端弯曲范围以外的管子表面接触。
대투관관단직선도측량방법진행료조사연구，인위목전측량투관관단직선도적직척태중，측량방법불정학，실제측량결과시관단국부직선도，병비관단직선도。채용마안규측량관단직선도시，마안규지점위치적관체궤하형상대측량정도유일정영향。통과대일비직련형투관접두편심원인진행분석，인위투관접두편심원인시관단만곡소치，관단만곡적원인시공엄관단직선도측량방법불정학，재가공라문접두지전미능발현관단만곡。건의채용족구경적직척측량관단직선도，보증직척지소유0．3 m（1영척）여관단만곡범위이외적관자표면접촉。
An investigation on measuring end straightness of casing is given in this paper.It is con-sidered that the actual measuring result is local position straightness,instead of pipe end straight-ness due to heavy ruler applied and incorrect measuring method for inspection end straightness;the pipe geometry at fulcrum position of saddle gage applied is effected to result of end straight-ness.Based on failure analysis for eccentric joint of extreme-line casing,it is found that the pipe end deviation from straight resulted in eccentric casing connection because the incorrect measuring method was applied to gage pipe end straightness and could not find the pipe end deviation from straight before threading in the mill.It is suggested that the ruler should be light enough,and the ruler should be touched 0.30 m at least with pipe behind end bend range as inspecting pipe end straightness.