Wellhead Choke and Kill Manifold, Subsea Manifold for Oil and Gas
In case of increase of the well head pressure, kill manifold can provide a means of pumping heavy drilling fluid into the well to balance bottom hole pressure so that well kick and blowout can be prevented. In this case, by using blowdown lines connected to the kill manifold, the increasing well head pressure also can be released directly for bottom hole pressure release, or water and extinguishing agent can be injected into the well by means of the kill manifold. The check valves on the kill manifold only allow injection of kill fluid or other fluids into the well bore through themselves, but do not allow any backflow so as to perform the kill operation or other operations.
The kill manifold consists of check valves, gate vales, pressure gauges and pipelines . The one end of the kill manifold is connected to the drilling spool and the other end is connected to the pump.The kill manifold and choke manifold are both designed to API 16C and can be used together.
(1)Working pressure of all pipelines, gate valves and check valves shall be compatible with that of the BOP stack used.
(2)The kill manifold is not intended to be used as common lines for pouring drilling fluid.
DD, EE, FF, HH
Performance Requirement Level
Oil (gas), mud, drilling fluid, gas containing H2S
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. The device is adopted to execute new drilling-well’s technique of balance pressure, which can avoid pollution of 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.
Assembly & structure:
Choke manifold consists of choke valve, gate valve, pipeline, fittings and pressure gauge etc
When the pressure rising in well, fluid in well can be 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 the casing pressure is quite high.
Pressure level is divided into five levels, i.e 14Mpa, 21Mpa,35Mpa,70Mpa and 105Mpa, meanwhile it can be also designed according to the requirements of customer.
(1)All the working pressures 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 be 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)Choke manifold be also able to work under a low temp condition.
2000 psi – 20000 psi
2 1/16”-4 1/16” (46-103mm)
Oil, Natural gas, mud, containing H2S, CO2 gases.
API Spec 16C, API Spec 6A
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