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gas well drilling, drilling fluid in the borehole is surely to be polluted by resident fluid, then the balance between hydrostatic fluid column pressure of drilling well fluid and reservoir pressure will be broken, causing overflow and blowout. When the polluted drilling fluid or hydraulic well whose pump performance is adjusted is cycled out so that the new balance can be achieved, the opening and close of choke valve to control back pressure so that the pressure of well bottom can be maintained in the situation of closing blowout preventer. Besides, Flexible choke&kill device can be used to clean well etc.
1、Application
Choke manifold is necessary device to control the well kick successfully and execute the pressure control technology on oil/gas well in the course of drilling, as it is, the device is adopted to execute new drilling-well's technique of balance pressure, which can prevent the pollution oil-layer, improve the speed of drilling and control blowout effectively. One end of the device connects with the side flange of BOP spool. When BOP closes, it can control the finite pressure from casing by adjusting the choke valve's opening, so balanced drilling can work under minimum pressure-difference.
• Working Pressure: 2,000Psi ~ 20,000Psi
• Nominal Bore Diameter: 2 1/16"~ 4 1/16"
• Working Medium: petroleum , natural gas ,water , mud , gas containing H2S,CO2
• Temperature Class: L~U
• Material Class: AA ~ HH
• Product Specification Level: 1 ~ 4
• Performance Requirement: 1 ~ 2
2、Specification and Structure
Choke manifold consists of choke valve, gate valve, pipeline,fittings and pressure gauge etc, see the above drawing and gate valve part and choke valve part. Pressure level is divided into five levels, i.e. 14MPa ,21MPa ,35MPa,70MPa,105MPa . It can be designed according to the requirement of customer.
3、Operating Requirement
1. All the working pressure of parts in choke manifold should be matched with the working pressure of the BOP stack used.
2. Choke manifold should be installed at the place where operator approach it conveniently, pressure test should be executed as installation, while the sealing test pressure should equal to the rated working pressure.
3.Pipeline should be so smooth and straight as possible, the corner of the pipeline should be made of 120°shaped forged steel bent pipe, which should have adequately large bore.
4. The working pressure gauge should be installed.
5. In winter, the choke manifold be able to work under a low temp condition.
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Type
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Working pressure
(Mpa) (psi)
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Nominal diameter
(mm) (inch)
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Bypass diameter
(mm) (inch)
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YJX140
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140Mpa (20000psi)
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103(4-1/16),78(3-1/16),
65(2-9/16),52(2-1/6)
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103(4-1/16),78(3-1/16),
65(2-9/16),52(2-1/6)
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YJX105
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105Mpa (15000psi)
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103(4-1/16),78(3-1/16),
65(2-9/16),52(2-1/6)
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103(4-1/16),78(3-1/16),
65(2-9/16),52(2-1/6)
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YJX70C YJX70E
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70Mpa (10000psi)
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103(4-1/16),78(3-1/16),
65(2-9/16),52(2-1/6)
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103(4-1/16),78(3-1/16),
65(2-9/16),52(2-1/6)
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(Y)JX35
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35Mpa (5000psi)
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103(4-1/16),78(3-1/16),
65(2-9/16),52(2-1/6)
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103(4-1/16),78(3-1/16),
65(2-9/16),52(2-1/6)
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(Y)JX21
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21Mpa (3000psi)
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103(4-1/16),78(3-1/16),
65(2-9/16),52(2-1/6)
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103(4-1/16),78(3-1/16),
65(2-9/16),52(2-1/6)
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