API Standard Drill Pipe for Oilfield Use

Product Description

There are different kinds of drill collars,including round drill collar,spiral drill collar,non-magnetic drill collar,square drill collar and so on.Ordinary drill collar is the circular cross section, the center has a water hole,the wall thickness is larger,the nozzle is smaller, the weight of per unit length is greater than the size of drill pipe almost 4- 5 times .The majority of drill collar is thread processing directly on the pipe body , but some of them also use the replaced joint.
Features and Advantages 1. Double Top Structure:drill pipr joints adopt the double ledge(double top)structure, such structure can enhance the tightness of joints so that the pressure of the mud could realize non-leakage half way. greatly reduce the resistance to polit drilling and back using this sturcture improves the torional strength of drill pipr so that the box thread will not deformed2. After optimal design of equal strength and the dispersion of stress to give dull play to the potiontioal of the drill pipr matrial.3. After forging joints materials, increased matrial density and change the material of fibrous tissue, thereby enhancing its machanical properties.4.Using joints nitride, phonsphide or copper treatment to ensure thread anti- corrosion, anti-stick, and improve joint surface fatigue resisitance.5. Unsetting& thickening to the tube, improvinig the metallurgical structure and enhancing the impact toughness, ensuring comprehansive mechanical properties and the friction weld seals not be broken.

Size	O.D(mm)	I.D.(mm)	Code	Thread	Length(mm)	Weight(kg)
3-1/8	79.4	31.8(1-1/4)	NC23-31	NC23	9140	298
3-1/2	88.9	38.1(1-1/2)	NC26-35	NC26	9140	364
4-1/8	104.8	50.8(2)	NC31-41	NC31	9140/9450	474/490
4-3/4	120.6	50.8(2)	NC35-47	NC35	9140/9450	674/697
5	127	57.2(2-1/4)	NC38-50	NC38	9140/9450	725/749
6152.4	57.2(2-1/4)	NC44-60	NC44	9140/9450	1125/1163
	71.4(2-13/16)	NC44-60		9140/9450	1022/1056
6-1/4	158.8	57.2(2-1/4)	NC44-62	NC44	9140/9450	1237/1279
		71.4(2-13/16)	NC46-62		9140/9450	1134/1172
6-1/2	165.1	57.2(2-1/4)	NC46-65	NC46	9140/9450	1352/1398
		71.4(2-13/16)	NC46-65	NC50	9140/9450	1249/1291
6-3/4	171.4	57.2(2-1/4)	NC46-67	NC46	9140/9450	1471/1521
7	177.8	57.2(2-1/4)	NC50-70	NC50	9140/9450	1597/1651
		71.4(2-13/16)	NC50-70		9140/9450	1494/1545
7-1/4	184.2	71.4(2-13/16)	NC50-72	NC50	9140/9450	1625/1680
7-3/4	196.8	71.4(2-13/16)	NC56-77	NC56	9140/9450	1895/1960
8	203.2	71.4(2-13/16)	NC56-80	NC56/6-5/8REG	9140/9450	2040/2109
8-1/4	209.6	71.4(2-13/16)	6-5/8REG	6-5/8REG	9140/9450	2188/2263
9	228.6	71.4(2-13/16)	NC61-90	NC61	9140/9450	2658/2748
9-1/2	241.3	76.2(2-13/16)	7-5/8REG	7-5/8REG	9140/9450	2954/3054
9-3/4	247.6	76.2(3)	NC70-97	NC70	9140/9450	3127/3234
10	254	76.2(3)	NC70-100	NC70	9140/9450	3308/3421
11	279.4	76.2(3)	8-5/8REG	8-5/8REG	9140/9450	4072/4210