Project Number | 519 |
Date of Summary | June 23, 2006 |
Subject | Technology Gaps in Deep Water HTHP Drilling |
Performing Activity | Triton Engineers Service Company |
Principal Investigator | Tom Proehl |
Contracting Agency | Minerals Management Service |
Estimated Completion | Completed |
Description |
The Deepstar CTR 7501 JIP for High-Pressure, High-Temperature drilling in
deep water involves the extension of techniques and technologies developed
since the 1950’s for floating offshore drilling units. These techniques are
well known and generally well-adapted to the deep water environment.
Technology gaps in deep water high-temperature high pressure (HTHP) drilling
can originate in four different ways:
The initial phase of DeepStar CTR 7501 involved the identification of the design drivers for deep water HTHP drilling. The fundamental design driver for this entire study is the particular relationship between pore pressure and the fracture gradient trends in the subsurface at any well location of interest. For any well drilling situation, that relationship defines the necessary casing points. Knowledge of the casing points define the relationship between casing size, weights and grades. That, in turn, defines the necessary well head equipment, the necessary drilling rig equipment, the amount and kind of mud products needed, and so forth. For the purposes of this study, high-temperature is defined as a reservoir temperature at or in excess of 350 deg F at a depth in the subsurface 27,000 feet below the mud line. Similarly, high-pressure is defined as a reservoir pressure of 24,500 psi at a depth in the subsurface 27,000 feet below the mud line. The base case is in 4,000 feet of water with sensitivity cases in 7,500 feet of water and sub salt wells. |
Report | |
AA (184 pages) | Drilling & Completion Gaps for HPHT Wells in Deep Water |
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