Xincheng Petroleum Technique Co.,Ltd.Dongying
   


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Products
Product type:Oil Country Tubular Goods--Drilling String
 
Name:Sprial drill collar
Item:ydaer_1
Description:
        Spiral drill collars are one kind of the products of our company. Spiral grooves make mud circulate freely around the drill collar to equalize pressure and prevent a seal from forming. It reduces the occurrence of differential pressure sticking.  Spiral prevents differential sticking without spiral.
        Spiral drill collars are widely used because of their maintenance features. The special grooves  decrease the volume of the contact between the well side and the pipe. It leads to the decrease of the tack of the pipe and to turning of the drill pipe string.

        The weight of round drill collars will be reduced  approximately 4-6% by spiral conversion.

Technical pramaters

O.D.
Cutting depth
Lead +- 25.4
(mm)
(in)
A(mm)
B(mm)
(mm)
86
3 3/8
3.5 +- 0.79
 
679
98.4
3 7/8
4.0 +- 0.79
 
914
101.6~111.1
4~4 1/8
4.8 +- 0.79
 
914
114.3~130.2
4 1/2~5 1/8
5.6 +- 0.79
 
965
133.4~146.1
5 1/4~5 3/4
6.4 +- 0.79
 
1067
149.2~161.9
5 7/8~6 3/8
7.1 +- 1.59
 
1067
165.1~177.8
6 1/2~7
7.9 +- 1.59
 
1168
181.0~200.0
7 1/8~7 7/8
8.7 +- 1.59
5.6 +- 0.79
1626
203.2~225.4
8~8 7/8
9.5 +- 1.59
6.4 +- 0.79
1727
228.6~250.8
9~9 7/8
10.3 +- 2.37
7.1 +- 1.59
1829
254.0~276.2
10~10 7/8
11.1 +- 2.37
7.9 +- 1.59
1930
279.4
11
11.9 +- 2.37
8.7 +- 1.59
2032

 
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