What is Cased and Perforated used in Drilling & Well Completion?
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How do the characteristics of cased and perforated sections in a wellbore impact the flow dynamics of produced fluids, considering factors like:

  • Wellbore diameter: How does the change in diameter between the open hole section and the cased and perforated section affect fluid velocity and pressure gradient?
  • Perforation density and size: How does the number and diameter of perforations influence the flow rate, pressure drop, and potential for formation damage?
  • Production fluid properties: How do the viscosity, density, and compressibility of the produced fluids affect the flow behavior through the perforated interval?
  • Formation characteristics: How do the permeability, porosity, and pressure gradient of the reservoir formation influence the fluid flow into the wellbore through the perforated section?
  • Wellbore pressure: How does the bottomhole pressure in the wellbore impact the flow rates and overall production from the perforated interval?

Additionally, how does the combination of these factors affect the overall efficiency and longevity of a well?

 cased  perforated
asked Aug. 5, 2024, 6:27 a.m.
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mohacamay
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Cased and Perforated in Drilling & Well Completion:

Cased and perforated is a crucial technique used in drilling and well completion to isolate different zones, control fluid flow, and enhance production from oil and gas wells.

1. Casing:

  • Steel pipe inserted into the wellbore after drilling, lining the hole and providing structural support.
  • Different sizes and grades of casing are used depending on the depth, pressure, and formation conditions.
  • Functions:
    • Prevent formation collapse: Casing stabilizes the wellbore, preventing caving in.
    • Isolate different zones: Multiple strings of casing are often used to separate formations with different pressures and fluids.
    • Provide a conduit for production: The production tubing is run inside the casing, allowing for efficient flow.
    • Protect freshwater aquifers: Casing helps prevent contamination of freshwater aquifers by isolating them from the wellbore.

2. Perforation:

  • Process of creating holes in the casing and cement sheath using specialized tools.
  • Allows communication between the wellbore and the reservoir.
  • Types of perforations:
    • Gun perforating: Uses explosives to create holes.
    • Jet perforating: Uses high-pressure jets to create holes.
    • Mechanical perforating: Uses a mechanical tool to cut holes.

3. Cased and Perforated Completion:

  • Combined technique where the well is cased and then perforated to maximize production.
  • Allows targeted production: Perforations are strategically placed to access specific zones with high hydrocarbon content.
  • Improved control: Perforation allows for selective production, minimizing water and gas production.
  • Enhanced recovery: By controlling fluid flow and accessing the reservoir effectively, cased and perforated completions optimize recovery.

In summary:

Cased and perforated techniques are essential for safe and efficient well completion. They provide stability, control, and optimized production, maximizing the recovery of hydrocarbons from oil and gas wells.

answer Aug. 5, 2024, 6:27 a.m.
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twihn90
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