FE 02-12 intro to Coring

Nội dung text: FE 02-12 intro to Coring

1. Coring: Purposes • Making reservoir analysis tests to determine porosity, permeability and residual oil and water saturations (primary purpose of coring) • To establish the physical character of formation boundaries • To furnish paleontologic data for age and facies correlation • To determine the structural attitude of the beds • To provide sedimentary and petrologic data from which depositional and diagnostic environment analysis can be made
2. Coring: Barrel Coring Types • Conventional – coring system with a outer and inner steel barrels • Containerized or Sleeved – utilizes disposable inner tubes/liners to improve core recovery and quality; core is not removed from its sleeve
3. Advantages of Sleeved Coring vs. Conventional Coring • Decreased exposure of the core to the atmosphere • Elimination or limitation of induced fracturing of the core during retrieval ops • Easy stablization of the core by resin injection or freezing • Easier core handling and transportation at surface
4. Coring: Barrel Cores 1. Coring tool 2. Core sample: on ave.: 60’ and 4” in diameter 3. Indication concerning height of beds 4. Clues concerning rock types
5. Coring: Core Sample
6. Sidewall Core Samples • The core samples, or plugs, are usually less than 1 inch in diameter and up to 4 inches long
7. Sidewall Cores: Disadvantages • Since sidewall plugs are small and may also have been crushed somewhat, they are not as good as barrel cores for determining porosity, permeability, or fluid saturations