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目前,世界上大多数国家的石油套管都采用美国石油学会(APISpec5CT)标准,螺纹则采用美国石油学会(APISpec5B)标准。随着石油开采向地层处的开发对,石油套管的要求越来越高,而API套管采用短圆螺纹、长圆螺纹、偏梯形和直连形形式,存在螺纹连接强度不高,各扣牙受力很不均匀,限制了其作业能力;同时12米长左右的套管端部直接加工螺纹,要达到螺纹密封,对机加工设备的要求很高,目前国内大部分公司不具备加工能力;另外这些螺纹采用单头螺纹,上紧时旋转的圈数较多,作业效率低。
At present, the oil casing in most countries of the world adopts the American Petroleum Institute (APISpec5CT) standard and the thread adopts the American Petroleum Institute (APISpec5B) standard. With the development of petroleum exploration to the stratum, the requirements of petroleum casing are higher and higher, while the API casing adopts short round thread, long round thread, partial trapezoid and straight connecting form, and the thread connection strength is not high. Teeth force is very uneven, limiting its operational capacity; the same time, about 12 meters of the casing end of the direct processing of the thread, to achieve thread sealing, high requirements for machining equipment, at present most of the domestic companies do not have the processing Ability; In addition, these threads with a single thread, when tightened more turns, low efficiency.