A Blowout Preventer (BOP) Control Unit as one of the drilling rig components, is a high-pressure hydraulic power system fitted with directional control valves to safely control well kicks and prevent blowouts during drilling operations. A typical system offers a wide variety of equipment to meet the customer's specific operational and economic criteria. The following text gives a brief description of the equipment and some of its design.
Control unit for surface-mounted BOP used for well drilling are usually "closed-loop" design hydraulic systems. This means two lines are required for all pressure open/pressure close BOP stack functions, and that fluid in one line is returned to the control unit reservoir when the other line is pressurized. These systems lend themselves to the use of petroleum-based fluids for the control system operating fluid. Since there is a possibility of an "ecological incident" in the event of a system leak, many offshore drilling contractors are turning to the use of water-based control system fluids. Water-based fluids have no detrimental effect on operations as long as:
(1) The environmentally safe lubricating agent is added to the water.
(2) Freeze protection is provided if the system is to be operated in cold climates.
(3) The fluid is regularly inspected and bacteria growth is checked either by addition of chemical agents or timely replacement of the fluid.
Water base control system fluid can be premixed in proper ratios in accordance with the control system manufacturers' recommendations. The control system manufacturer should specify control system fluid that is compatible with the equipment seals and materials.
The main accumulator with its hydraulic control manifold, separate hydraulic manifold, or hydraulic panel should be installed in a safe area protected from falling debris or gas accumulations during a blowout. All of the control functions should be operable from the drill floor by use of a remote control panel.
A second remote control panel is recommended. This panel is normally located in the tool pushers office or in a safe egress area and is intended as a last means to close in the well as the rig is being abandoned. The initial installation, should be fully tested according to the recommended BOP control system acceptance procedures to ensure proper leak-free operation and correctness of function.
The hydrostatic test should be to full working pressure and/or ten percent below any relief valves in the line. Piping downstream of the pressure-reducing and regulating valves should be tested to the maximum (full open) regulator settings. Automatic pump system cut-off devices should be tested to ensure the pumps cut off at the maximum system design working pressure.
The system design capacities should be verified at the initial installation and interface of the control system to the BOP stack. The contractor must ensure that all oil and gas companies, local statutes, governmental, and other governing agencies at the drilling venue have been met in the design. In particular, the contractor must ensure the following:
(1) The control system design meets or exceeds the performance requirements of the most stringent of the regulatory bodies in force.
(2) Accumulator precharge is maintained within the control system manufacturer's specification.
(3) Pump system cut "on" and cut-off automatic set points are maintained at the control system manufacturer's specification for the system design.
(4) Closing response times from activation at any control point are within the time limits of the most stringent of the regulatory bodies in force.
As the leading enterprise in the oil and gas industry, Vigor's BOP Control Unit is designed by a professional team. And they manufactured the BOP control unit strictly adhere to API 16D standard. Before the delivery, the product will be inspected many times to ensure the quality. Quality first is always Vigor's working principle which is known within the oil and gas industry. If you are interested in our products, please contact us as soon as possible.
For more information, you can write to our mailbox:
info@vigorpetroleum.com (Erica)
mail@vigorpetroleum.com (Joppa)
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