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| 【Blowout Preventor】-->【Ram BOP】
 |
Blowout
Preventor(BOP) is classified into two kinds of drilling
BOP and operation BOP.
·The BOP includes conventional ram BOP, manual single-ram
cable BOP, manual fully-enclosed single-ram BOP , manual
multi-function single-ram BOP(with fully-enclosed, semi-enclosed
and self-enclosed head) and barrel & annular BOP
·Driving mode：Manual & hydraulic
·End connection ：Flanged and bolted
·Working pressure：2000~10000PSI
·Nominal
bore：90mm、120mm、179.4mm、279.4mm、346mm
·Executive standard: API 16A and relevant
specification |
【Blowout Preventor】-->【Annular
BOP】
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1. Application
Used in conjunction with hydraulic
control system, the annular BOP seals off the annulus of
different sizes when pipes are in use in the hole. An annular
BOP can also seal off the hole when no pipe is in it. When
used in conjunction with the pressure-regulating valve and
accumulator, the annular BOP allows snubbing service.
2. Working Principles
A hydraulic control system is used
to close or open the |
annular preventer. when it is
closed, high pressure oil is directed to the closing chamber
positioned in the lower side of the piston, causing the
piston to move upward. The packing unit is compressed by
the moving piston. Because the annular BOP has a cap, the
packing unit can not move upward and only can move toward
the center of the well to pack off a string or seal off
the well.
3. Operating Requirements
(1) The annular BOP can be used
to seal off a well where the drill pipe is in use if the
well blowout. However, the annular BOP cannot be closed
for a long time, because the packing unit is easy to be
damaged and the BOP itself has no locking mechanism.
(2) It is necessary to use a drilling
tool with 18°bevel when running/retrieving drill of operation
with BOP, running/retrieving drill should be slow pass through
the nipple and all the rubber protecting collar on the drilling
tool should be discharged off.
(3) With the annular BOP in the
closed position and shut-in pressure kept below 5MPa, the
string can be moved either up or down, but mustn’t be rotated.
(4) It is forbidden to open the annular BOP to relieve the
pressure out of the well to avoid rubber core damage.
(5)Be sure to check whether the
annular BOP is in the full open position or not every time
after opened in order to prevent damage to the packing unit.
(6) Clean the inside of the BOP
after well cementing operation is completed in order to
keep its closings and openings flexible.
(7) More attention shall be paid
to ring gaskets and gasket grooves during installation of
the BOP or its removal from the service.
(8) After entering the destination
layer, running/retrieving drill once should be accompanied
with test of well-enclosed with drilling tool once, and
inspect the effect of well enclosed with rubber core, if
beyond the requirement, it should be replaced.
(9) Periodically perform pressure
test on the annular BOP in accordance with applicable standards.
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