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     Chock and kill      manifold
     Wellhead Device
     Christmas Tree
     Gate Valve
     Chock valve
     Check valve
 
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Choke Manifold
  1、 Application
  Choke manifold is necessary device to control thewell kick successfully and execute the pressure controltechnology on oil/gas well in the course of drilling, as itis, the device is adopted to execute new drilling-well'stechnique of balance pressure, which can avoid pollu-tion of oil-layer, improve the speed of drilling and con-trol blowout effectively. One end of the device connectswith the side flange of BOP spool. When BOP closes, itcan control the finite pressure from casing by adjustingthe choke valve's opening, so balanced drilling can workunder minimum pressure-difference.
  2、 Assembly & structure
  Choke manifold consists of choke valve, gate valve,pipeline, fittings and pressure gauge etc, see gate valvepart and choke valve part in the above drawing
  3、 Working principle
  When the pressure rising in well, fluid in well canbe released in utilization of the choke valve opening/closing in choke manifold to control casing pressure,which can directly blow out through gate valve as thecasing pressure is quite high.
  4、 Specification
  Pressure level is divided into five levels, i.e. 14MPa,21MPa, 35MPa, 70MPa and 105MPa,it can be also de-signed according to the requirement of customer.
  5、 Operation requirement
  (1) All the working pressures of parts in choke mani-fold should be matched with the working pressure ofthe BOP stack used;
  (2) Choke manifold should be installed at the place where operator approach it conveniently, pressure testshould be executed as installation, while the sealing testpressure should be equal to the rated working pressure;
  (3) Pipeline should be so smooth and straight aspossible, the corner of the pipeline should be made of120°shaped forged steel bent pipe, which should haveadequately large bore;
  (4) The working pressure gauge should be installed;
  (5) In winter, the choke manifold be able to workunder a low temp condition.

No. Item Quantity Material Remarks
A Lifting Base 1    
B 105/78 Fluid Throttle Valve 2   Please refer to Throttle Valves for details.
C Five-Joint 1 30CrMo  
D 52/105 Flat Valve 1   Please refer to Gate Valves for details
E Pressure Gage 1    
F Break Valve 1    
G Meter's Flange 1 30CrMo  
H 78/105 Flat Valve 10   Please refer to Gate Valves for details
I 78/105 Flange Stub End 2    
J Cross-Tee 5 30CrMo  
K 103/105 Blind Flange 7 30CrMo  
L 103/105Flange Stub End 1    
M 103/105Flat Valve 2   Please refer to Gate Valves for details
N 78/105hand Throttle Valve 1   Please refer to Throttle Valves for details.
 
 
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