Pressure analysis for horizontal wells
This paper presents horizontal-well test design and interpretation methods. Analytical solutions are developed that can be handled easily by a desktop computer to carry out design as well as interpretation with semilog and log-log analysis. These analytical solutions point out the distinctive behavior of horizontal wells: (1) at early time, there is a circular radial flow in a vertical plane perpendicular to the well, and (2) at late time, there is a horizontal pseudoradial flow. Each type of flow is associated with a semilog straight line to which semilog analysis has to be adapted. The horizontal pseudoradial flow takes into account a pseudoskin depending on system geometry, which is a priori defined and estimated. Practical time criteria are proposed to determine the beginning and the end of each type of flow and to provide a guide to semilog analysis and well test design. The authors study the behavior of uniform-flux or infinite-conductivity horizontal wells, with wellbore storage and skin. The homogeneous reservoir is infinite or limited by impermeable or constant-pressure boundaries. A method is also outlined to transform all our solutions for homogeneous reservoirs into corresponding solutions for double-porosity reservoirs.
- Research Organization:
- Elf Gabon (FR); Elf Aquitaine (FR)
- OSTI ID:
- 6482952
- Journal Information:
- SPE (Society of Petroleum Engineers) Format. Eval.; (United States), Journal Name: SPE (Society of Petroleum Engineers) Format. Eval.; (United States) Vol. 3:4; ISSN SFEVE
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
020200 -- Petroleum-- Reserves
Geology
& Exploration
020300* -- Petroleum-- Drilling & Production
ANALYTICAL SOLUTION
CALCULATION METHODS
DESIGN
DIRECTIONAL DRILLING
DRILLING
FLUID FLOW
GEOMETRY
HORIZONTAL INTEGRATION
MATHEMATICS
POROSITY
RESERVOIR PRESSURE
RESERVOIR ROCK
WELL PRESSURE