other
HOT PRODUCT
  • Gear Metering Pump
    Gear Metering Pump

    ‌RockySea Petro Gear Metering PumpGear metering pump is a kind of gear pump. Only specific gear pump can be called gear metering pump. At the same time, the gear metering pump is one kind of metering pump, so gear metering pump has metering characteristics. In order to meet the market demand at home and abroad, RockySea has successfully developed a gear metering pump after years of research and development.Select suggestionsThe main technical parameters of gear metering pump include displacement,

    VIEW DETAILS
  • Large Displacement Tubing Pump
    Large Displacement Tubing Pump

    ‌RockySea Petro Large Displacement Tubing PumpNote: if our client needs different specifications and models of special oil well pump, we can also design and manufacture according to the parameters and requirements provided by the client.These special oil well pumps have novel structure, reliable performance, superior pump efficiency, and long service life, and have been widely used in various oilfields.RockySea Petro has developed a series of special oil well pumps suitable for different well conditions.Bas

    VIEW DETAILS
  • Tubing Pump
    Tubing Pump

    ‌RockySea PetroTubing PumpThe raw material of tubing pump parts should be inspected after heat treatment, the mechanical properties, chemical compositions and metallographic structures must be inspected by batch. The tubing pump parts should be inspected several times during the processing procedure.Best tubing pump manufacturer in ChinaRockySea Petro also developed the downhole pumps with various processes of boronizing, nitriding, chrome plating, tungsten plating for special well conditions.Some key point

    VIEW DETAILS
  • Hydril Annular BOP
    Hydril Annular BOP

    ‌RockySea Petro Hydril Annular BOPThe Hydril Annular BOP has carried out rigorous tests, such as magnetic particle, ultrasonic, pressure test and and so on.Do the pressure analysis to pressured and forced parts with 3D software to check the strength of Hydril Annular Blowout Preventer.RockySea Petro Petro designs various types of Hydril Annular BOP according to the International standard.RockySea Petro Petro has more than 20 years of experience in oil wellhead and Hydril Annular BOP production, with advanced manuf

    VIEW DETAILS
  • Gate Valve
    Gate Valve

    ‌RockySea Petro Gate ValveThe wellhead and christmas tree has carried out rigorous tests, such as magnetic particle, ultrasonic, pressure test and and so on.Do the pressure analysis to pressured and forced parts with 3D software to check the strength of wellhead and christmas tree.RockySea Petro designs various types of oil wellhead according to the International standard.RockySea Petro Petro manufactures Gate valve in China. We have our own factory of Gate valve. RockySea Petro Petro provide the high quality and competi

    VIEW DETAILS

Spiral Drilling Collar

Date:2024-05-05 Popularity:800

RockySea Petro Spiral Drill Collar




In directional drilling, due to the large deviated well and the large contact area between the drill collar and the borehole wall, problems like sticking and jamming are more likely to happen. The spiral drill collar reduces the contact area between the drill collar and the borehole wall, so it is widely used. Spiral drill collars are not listed in intl standards, but due to its practical value, many manufacturers have produced them.


Description 

The function of the spiral drill collar is to reduce the occurrence of sticking and sticking. Three right-hand spiral grooves are machined on the outer cylinder of its circular drill collar. A 305-560mm section of the circular drill collar without grooves is reserved at the external thread joint and 475-610mm section of the internal thread end joint. Its weight is 4% less than that of the circular drill collar of the same size. RockySea Petro has rich experience in R & D, production and sales of spiral drill collars to all over the world for more than 20 years old.

Types and Structure 

There are many kinds of spiral drill pipes manufactured by SanJack. Take the most commonly used BI and BII as examples.

BII type: This type of drill collar has three spiral grooves, which are right-handed and evenly distributed. External contour curve equation:. Where: ρ— Pole diameter; θ— Polar angle; R – radius; E-coefficient. Outer diameter 171.5 mm (6 3 / 4 inch); The maximum cutting depth is 7.1mm; Lead 1000 ± 25.4 mm.



BI type: 
This type of drill collar has three spiral grooves and is distributed in right-hand rotation. Outer diameter: 165.1mm ~ 177.8mm (6 1 / 2 ~ 7 inches); Cutting depth: 7.9 ± 1.59mm; Lead: 1168 ± 25.4 mm.





Features 

Country of Origin: China

Nominal OD: 4 3/4” (4.750”) to 9” 1/2” (8.500”)

Nominal ID: 2.250” to 3” (3.000”)

Material Grade: AISI 4145H Modified

Nominal Weight: 45.00# to 144#

Nominal Wall Thickness: 3.250”

Drift Size: 2.125” to 2.875”

Manufacturing Criteria:  NS-1

Relevant tool joint Parameters

Connection: NC38,  Regular, REG

Bend Stress Ratio: 1.920 to 3.061

OD: 4 3/4” (4.750”) to 9”1/2” (9.500”)

ID: 2.563” to 3” (3.000”)


Application

  • Spiral drill collars can help to control the direction of the bottom hole assembly, avoiding the problem of hole deviation and enhancing the performance of drilling.
  • The presence of the spiral drill collars allows the pipelines to stay in the tensile state, while guarantees the rigidity of the drill string under great compression. Thus, the drill efficiency and quality are greatly improved.
  • Apart from providing weight on the bit (WOB), spiral drill collars also work as a shock absorber to dampen the vibration and shaking when drilling takes place. In this way, the drilling process can be carried out in a much steadier state.
  • Due to the structural features, spiral drill collars can provide weight for drilling purpose. Gravity works on a number of drill collars to offer enough downward force needed to break rocks with the drill bit.


RockySea Petro Copyright © 2008-2025 Inc. SITEMAP