钻具接头的识别方法

钻具接头的识别方法钻具接头：是带有密封台肩的锥管螺纹短节。又称旋转台肩式连接螺纹。其特点：螺纹只起连接作用，而不具备密封性能，台肩面是唯一密封部位（实际操作中必须上够扭矩）。一、接头类型分类依据类型分类依据类型水眼大小内平（数字扣）贯眼正规扣型一公一母双公双母上扣方向顺时针（正扣）右旋扣反时针（反扣）左旋扣用途配合保护二、接头系列代号1、接头代号接头类型国产苏制API正规式ZGЗНREG贯眼式GYЗЩFH内平式NPЗУIF2、各种型号接头优缺点：正规式：内、外径小，流动阻力大，强度大。贯眼式：内、外径较正规接头，内平接头小。优点较两者之间。内平式：内、外径大易磨损，强度低，流动阻力小。3、数字型接头64年美国石油学会、钻井和服务设备委员会为了改进旋转台肩式连接螺纹的工作性能，采用了新型数字型接头系列。这种接头以螺纹基面中径的英寸和十分之一英寸数字值表示，具有1.651mm的平螺纹顶和0.965mm的圆形螺纹底。螺纹牙型以V-0.38表示，并可与V-0.065牙型相连接。随后又将API标准中的全部内平和除51/2″FH外的全部贯眼型接头均列为废弃型接头而逐渐淘汰。在数字型接头中有几种和旧的API标准中的接头有相同的节圆直径、锥度、螺距和螺纹长度，所以可以互换。接头类型互换对照表数字型接头API标准接头数字型接头API标准接头NC2623/8″IF（内平）NC404″FH（贯眼）NC3127/8″IF（内平）NC464″IF（内平）NC3831/2″IF（内平）NC5041/2″IF（内平）三、接头识别1、使用接头尺丈量（直接读数）2、用钢板尺（或钢卷尺）Ａ、用钢板尺直接丈量公扣小端外径或母扣端部台肩内径，查接头扣型尺寸表。接头扣型尺寸直径（mm）扣型公扣小端外径d2直径（mm）扣型母扣端部台肩内径d4正规式23123133143153163145.1754.2064.8990.46110.20131.02正规式23023033043053063065.178.691.3119.9142.8154.7贯眼式22132142152162170.0877.4496.21126.78150.37贯眼式22032042052062094.5103.9124.1150.5174.1内平式21121131141151161160.3571.4484.93114.30141.29168.26内平式21021031041051061074.4588103.9134.94164.3190.6Ｂ、量丝扣长度及两端直径，计算出锥度（即1：45或1：6）。丈量出每寸扣数（5扣/寸、4扣/寸）。查API接头规范表。Ｃ、合扣（直接将两只接头上在一起看是否相匹配）。Ｄ、正反扣识别：面对接头丝扣截面，观察每圈螺纹。左低右高为正扣；左高右低为反扣。四、接头扣型表示方法（代号）接头扣型常用3位数字表示（除NC扣外）。如211、431、520等。通常用一句话讲1平、2贯、3正规、0母、1公。具体表示方法说明如下：API扣型尺寸规范一、数字扣尺寸规范：扣型公接头（大小端）公扣长母扣长母扣直径NC2385.1052.4076.2092.0766.75NC2673.0560.3576.2692.0774.61NC3186.1371.3288.90104.7887.70NC3594.9779.0965.25111.1396.84NC38102.0085.06101.60117.48103.58NC40108.7190.66114.30130.18110.33NC44117.4798.42114.30130.18119.06NC46122.78130.73114.30130.18124.61NC50133.35114.30114.30130.18134.91NC56149.25117.50127.00142.88150.81NC61163.50126.6139.7155.58165.10NC70185.75147.65152.40163.22187.33NC77203.20161.85165.10180.98204.79NC23---NC774扣/英寸二、API扣型尺寸规范：扣型公接头（大小端）公扣长母扣长母扣直径230（小）66.6747.6276.2092.0768.26230（大）76.2053.9788.90104.7877.7833088.9065.0795.2511.1390.49430117.4790.47107.95123.83119.10530140.21110.06120.65136.53141.68630152.19131.03127.00142.88153.99730177.80144.47133.35149.23180.18830201.98167.84136.53152.40204.39320101.4577.6295.25111.13102.79420108.7189.66114.30130.18110.33420121.7296.31101.60117.48123.83520147.95126.79127.00142.88150.02620171.52150.37127.00142.88173.8321073.0560.3576.292.0874.6121086.1371.3188.90104.7887.71310102.085.06101.60117.48103.584A0122.70103.73114.30130.18124.61410133.35114.30114.30130.18134.94510162.48141.32127.0142.88163.91