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API Drill Collar Spiral Drill Collar and non magnetic drill collar


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.
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  • 84139100

Standard spiral drill collar for well drilling

Hff4d65b542dd415c841d4c1aa82d59e5R - 副本

Features

(1)Eccentric-weight drill collar is an effective anti-deviation drilling tool,with high drill pressure used in oblique areas,rectifying oblique as well.

(2)When drilling directional wells eccentric-weight drill collar is an effective tool to reduce oblique or straighten the well hole using high drilling pressure.

(3)Eccentric-weight drill collar has the advantages of simple structure,convenient use,connected directly to common drill collar without centralizers,greatly convenient for sinking in,fishing and milling operations.

(4)Eccentric-weight drill collar runs downhole safely,danger of leakage or bit freezing hard to appear.

(5)Pay much attention to avoid mud balling and prevent effect of anti-deviation .

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
                           6
         152.4
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
Mechanical properties:<7 inch Drill Collar:Yield Strength≥758MPa,Tensile Strength≥965MPa,Four times elongation≥13%,Impact energy Ak≥54J,(Single impact work≥47J,Average≥54J)Hardness range 285HB~341HB≥7inch Drill Collar:Yield Strength≥689MPa,Tensile Strength≥931MPa,Four times elongation≥13%,Impact energy Ak≥54J,(Single impact work≥47J,Average≥54J) Hardness range 285HB~341HB



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