Shale shakers Suction line

driller . The crew will generally consist of a derrickman (who also tends the
pumps while drilling), 3 roughnecks (working on rig fl oor), plus a mechanic, an
electrician, a crane operator and roustabouts (general labourers).
Service company personnel are transported to the rig as and when required.
Sometimes they are on the rig for the entire well (e.g. mud engineer) or only for a
few days during particular operations (e.g. directional drilling engineer).
23.Blowout Prevention (BOP) EQUIPMENT
The blowout prevention (BOP) equipment is the equipment which is used to shutin
a well and circulate out an influx if it occurs. The main components of this
equipment are the blowout preventers or BOP's. These are valves which can be
used to close off the well at surface. In addition to the BOP's the BOP equipment
refers to the auxiliary equipment required to control the flow of the formation fluids
and circulate the kick out safely.
There are 2 basic types of blowout preventer used for closing in a well:
• Annular (bag type) or
• R am type.
It is very rare for only one blowout preventer to be used on a well. Two, three or
more preventers are generally stacked up, one on top of the other to make up a BOP
stack. This provides greater safety and flexibility in the well control operation. For
example: the additional BOPs provide redundancy should one piece of equipment
fail; and the different types of ram (see below) provide the capability to close the
well whether there is drillpipe in the well or not. When drilling from a floating
vessel the BOP stack design is further complicated and will be dealt with later.
6.1 Annular Preventers
The main component of the annular BOP (Figure 18) is a high tensile strength,
circular rubber packing unit. The rubber is moulded around a series of metal ribs.
The packing unit can be compressed inwards against drillpipe by a piston, operated
by hydraulic power.
The advantage of such a well control device is that the packing element will close
off around any size or shape of pipe. An annular preventer will also allow pipe to
be stripped in (run into the well whilst containing annulus pressure) and out and
rotated, although its service life is much reduced by these operations. The rubber
packing element should be frequently inspected for wear and is easily replaced.

29. 
    MWD system
    

Measurement While Drilling - MWD systems allow the driller to gather and transmit
information from the bottom of the hole back to the surface without interrupting
normal drilling operations. This information can include directional deviation data,
data related to the petrophysical properties of the formations and drilling data, such
as WOB and torque. The information is gathered and transmitted to surface by the
relevant sensors and transmission equipment which is housed in a non-magnetic drill
collar in the bottom hole assembly (Figure 1). This tool is known as a Measurement