yehia presents driller
TRANSCRIPT
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High pressures and temperatures impact mud properties in a dynamic
way, and can have effects on well control
Small margins between pore and fracture pressures will prevail in
sections of the well
The conditions are above the critical point for the gas/oil/condensate
influx; which means that the hydrocarbon influx is infinite soluble in the
base oil of the mud.
Hydrocarbon influx will totally mix with the base oil in oil based mud
(OBM), and infinite amounts of gas can dissolve in the mud
Drilling of inclined and horizontal wells will make the consequences of
barite sag serious
Significant quantities of gas can diffuse into a horizontal section of a well
if OBM is used even if the well is overbalanced.
The drilling of HPHT wells pose special challenges compared to
standard wells :
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The objectives and motivation to perform modeling work in theplanning phase of an HPHT well are multiple:
. Address the concern over the high number of well control incidents during
drilling HPHT wells
. Address the fact that a growing number of well control incidents in HPHT
wells take place during completion
. Identify any well control risk for the particular well
. Confirm that existing procedures are according to best practice.
. Develop revised procedures if current procedures are not optimal
. Improve crew training and make it more relevant
The Objectives of Modeling Work in planning an HPHT Well
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Introduction
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Electronic components such as integrated circuits are frequently the weakestlink in a logging tools operational performance at high temperature. Typically,most electronic systems in logging tools are built from commercially availablehigh-temperature US military specified components.Increasing tool rating these commercial electronic systems are rated to 350 Ffor continuous operation.
The temperature increase inside a logging tool depends on two factors:
Drilling Logging
1- The heat flow from the outside environment
2-The heat dissipated by the power consumption of the internal components.
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Therefore, the use of low-power components and efficient circuit design helps
reduce the internal temperature increase coming from the heat generatedinside the tool.
Conventional logging tools (rated to 350 Fand 20,000 psi 1140 MPa) areupgraded to high-temperature specifications by installing all sensitive electroniccomponents in a 20,000-psi pressure-rated Dewar flask housing (above). The
Dewar flasks protect the electronic circuits from excessive boreholetemperatures. However, weight becomes a concern in HPHT wells because theflasks add weight to long combinations of tools. In deep HPHT well Is theadded cable tension from the additional weight of the flasked tools reduces theamount of pull that can be made on the cable before the limits of the weak pointare reached.