Geology Reference
In-Depth Information
The DRMWD includes DRMWD-MD downhole instruments and
DRMWD-MS surface devices, as shown in Figure 10.3.1-4, which communicate
with each other through pressure pulse signals in the drilling mud channel; they
assist each other in real-time monitoring of downhole tool status, operating
conditions and related measurement parameters (including inclination, azimuth,
tool surface and other orientation parameters, gamma and resistivity and similar
geologic parameters as well as pressure and engineering parameters).
Surface Devices are composed of ground sensors (e.g., pressure, depth and
pump stroke sensors), instrument shed, front-end receiver and ground signal
processing devices, host computer and peripherals, and associated software, with
sophisticated signal processing capabilities permitting operations up to and
beyond 4500m. Downhole Instruments is composed of non-magnetic drilling
collar, positive pulse generator installed in the non-magnetic drilling collar,
driver sub, power supply unit, directional sub and a downloading data
connection assembly. It is upwardly connected to a common (or non-magnetic)
collar and downwardly to WLRS. Since it adopts an open bus design,
DRMWD-MD is compatible with different types of pulsers. In addition to its
application with DRGDS, DRMWD can be used in other operations.
CFDS is mainly composed of data processing and analysis software, and
drilling trajectory design and steering decision-making software. Additionally, it
has analysis, data management and chart output modules, and so on. This
software system helps process and analyze near-bit resistivity, natural gamma
and other geologic parameters uploaded during drilling in real-time, and explain
and assess the economic potential of the newly-drilled strata. Simulations for
the geological formation to be drilled (ahead of the drill bit) are made, and then,
necessary adjustments to well trajectory are calculated. This geosteering
increases the probability for exploration success, as downhole recommendations
are implemented by direct drilling control. Surface and downhole system
architecture are shown immediately below.
Search WWH ::
Custom Search