Research on Wellbore Temperature Field in Deep-Water CML
213
This drilling technology solves the problem of difficult wellbore pressure control
in deep-water drilling by adjusting the surface mud pump, submarine lift pump and
top fill pump in real time, controlling the drilling fluid level height in the riser, and
then accurately controlling wellbore pressure, as shown in Fig. 1. Effective wellbore
pressure control is the key to ensure safe and efficient drilling, and wellbore temperature
distribution law is the basis of wellbore pressure prediction and control. At the same time,
wellbore temperature changes have a significant impact on drilling fluid performance,
borehole wall stability, downhole tools, etc. [4–7]. Therefore, it is necessary to study
the wellbore temperature distribution law of deep-water CML dual-gradient drilling,
to ensure the safety and efficiency of deep-water CML dual-gradient drilling, and to
provide technical reference for the effective development of China’s rich oil and gas
resources in the South China Sea.
Fig. 1. Schematic diagram of CML dual-gradient drilling
In this paper, the coupling relation of wellbore temperature, pressure, drilling fluid
density and rheological property is considered comprehensively. Combined with the
characteristics of deep-water CML dual-gradient drilling technology, the transient heat
transfer model of deep-water CML dual-gradient drilling is established. Through practical cases, the temperature distribution law of CML dual-gradient drilling wellbore is
analyzed.
213
This drilling technology solves the problem of difficult wellbore pressure control
in deep-water drilling by adjusting the surface mud pump, submarine lift pump and
top fill pump in real time, controlling the drilling fluid level height in the riser, and
then accurately controlling wellbore pressure, as shown in Fig. 1. Effective wellbore
pressure control is the key to ensure safe and efficient drilling, and wellbore temperature
distribution law is the basis of wellbore pressure prediction and control. At the same time,
wellbore temperature changes have a significant impact on drilling fluid performance,
borehole wall stability, downhole tools, etc. [4–7]. Therefore, it is necessary to study
the wellbore temperature distribution law of deep-water CML dual-gradient drilling,
to ensure the safety and efficiency of deep-water CML dual-gradient drilling, and to
provide technical reference for the effective development of China’s rich oil and gas
resources in the South China Sea.
Fig. 1. Schematic diagram of CML dual-gradient drilling
In this paper, the coupling relation of wellbore temperature, pressure, drilling fluid
density and rheological property is considered comprehensively. Combined with the
characteristics of deep-water CML dual-gradient drilling technology, the transient heat
transfer model of deep-water CML dual-gradient drilling is established. Through practical cases, the temperature distribution law of CML dual-gradient drilling wellbore is
analyzed.