钻具螺纹类型识别方法 文档

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1、如何确认钻具螺纹扣型塔里木油田钻具中心提供为了方便钻井队工程师确认各种钻具螺纹扣型，在没有接头尺的前提下，现场能更好的、准确的、迅速的识别各种钻具螺纹扣型，特提供如下钻具螺纹扣型识别方法和数据：1、测量工具：游标卡尺或内、外卡钳、钢板尺。2、识别内螺纹扣型测量螺纹开孔最大内径，对照表2红色数据；3、识别外螺纹扣型测量螺纹大端最大外径，对照表2紫红色数据；4、数字型螺纹、内平螺纹、正规型螺纹测量数据误差正负只要不超过3mm不用担心扣型选错。5、NC数字型各种双台肩螺纹及HT40双台肩螺纹，内螺纹开孔和外螺纹大端直径与同类型普通螺纹尺寸相同。(NC数字型

2、各种双台肩螺纹与同类型普通螺纹可以互换)6、外螺纹有应力减轻槽者测量应力减轻槽直径对照表1数据。7、有一种外螺纹为LET应力减轻扣，这种扣只用于NC61公螺纹，常见有9"钻铤和同类型扶正器公螺纹，测量方法为测量外螺纹大端直径，包括未屑平的1mm扣高值。见表1第9项表1外螺纹应力分散槽直径单位；mm序号螺纹类型标准外螺纹锥部大端直径应力槽直径1NC35（43/4"DC）94.9783.52NC38（5"DC）102.0089.103NC40108.7195.814NC44117.48104.575NC46（61/4"DC）122.78109.886NC

3、50（7"DC/73/"4DC）133.35120.457NC56（8"DC）149.25134.04851/2FH（WDP）148.00136.509NC61LET（9"DC）163.53159.53表2API石油钻具接头螺纹尺寸单位mm螺纹类型螺距每25.4mm牙数锥度可互换螺纹外螺纹锥部大端直径外螺纹圆柱部分直径外螺纹锥部小端直径外螺纹锥部总长度内螺纹最小有效长度内螺纹锥部长度内螺纹扩锥孔大端直径数字型（NC）NC236.3541;665.1061.9052.4076.279.492.166.7NC266.3541;662A11×2A1073.

4、0569.8560.3576.279.492.174.6NC316.3541;6211×21086.1382.9671.3288.992.1104.887.7NC356.3541;6694.9792.0879.0995.298.4111.196.8NC386.3541;6311×310102.0098.8385.06101.6104.8117.5103.6NC406.3541;664A21×4A20108.71105.689.66114.3117.5130.2110.3NC446.3541;66117.47114.2798.42114.3117.51

5、30.2119.1NC466.3541;64A11×4A10122.78119.61103.73114.3117.5130.2124.6NC506.3541;66411×410133.35130.43114.30114.3117.5130.2134.9NC526.3541;6×138.63135.80119.57114.3117.5130.2140.2NC566.3541;4×149.25144.86117.50127.0130.2142.9150.8NC616.3541;4×163.525159.16128.60139.7142.9155.6165

6、.1NC706.3541;4×185.75181.38147.65152.4155.6168.3187.3NC776.3541;4×203.20198.8161.95165.1168.3181.0204.8正规型（REG）23/8REG5.0851;42A3066.6763.947.6276.279.492.168.327/8REG5.0851;423076.2073.453.9788.992.1104.877.831/2REG5.0851;433088.9086.165.07595.298.4111.190.541/2REG5.0851;44301

7、17.47114.790.47107.9111.1123.8119.151/2REG6.3541;4×140.20137.4110.05120.6123.8136.5141.765/8REG6.3541;6630152.19149.40131.03127.0130.2142.9154.075/8REG6.3541;4×177.80175.01144.47133.3136.6149.2180.285/8REG6.3541;4×201.98199.14167.84136.5139.7152.4204.4贯眼型（FH）31/2FH5.0851;4×101.

8、44—77.6295.298.4111.1102.84FH6.3541;4NC40108.71105.689