THE 3
rd
INTERNATIONAL SCIENTIFIC CONFERENCES OF STUDENTS AND YOUNG RESEARCHERS
dedicated to the 99
th
anniversary of the National Leader of Azerbaijan Heydar Aliyev
76
Table 1.
Mud types in different pressure and temperature intervals.
Run
Sample
Pressure (psi)
Temperature Range (
℉
)
1
Oil
based mud
5000
70-550
2
-
10000
70-550
3
-
15000
70-550
4
-
20000
70-550
5
-
25000
70-550
6
-
30000
70-550
7
-
35000
70-550
8
Water based mud
5000
70-500
9
-
15000
70-500
10
-
25000
70-500
11
-
35000
70-500
For oil and gas industry, high temperature and high pressure activities
appear to be a new normal. Drilling into reservoirs with high pressure and
temperature as well as drilling formations with high bottom hole temperatures
necessitates a fluid with stable rheological qualities.
Loss of viscosity and
fluid loss control can be occurred by water-based mud, whereas oil-based
mud can be used so as to withstand high temperatures. Although oil-based
muds are expensive, there are some advantages of this type of mud, such
as shale stability, better gauge hole, faster penetration rate, less bit balling
and reduction in differential sticking, which in turn will result in more proper
work. Therefore, oil-based mud can withstand
higher pressures and
temperatures than water-based mud. In addition to this, oil-based mud has
higher failure temperature in comparison with water-based mud. Thus, a
proper choice for most of the HPHT applications in the event of not violating
the environmental regulations is oil-based mud. HPHT drilling, on the other
hand, necessitates the development of an environmentally acceptable water-
based mud. A new water-based mud polymer solution
that is ecologically
friendly has been tested for drilling applications at temperatures up to 232
℃
(450
℉
). Synthetic polymers are newly developed by the system components
that do not contain chromium or other environmentally harmful materials.
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