Hydraulic fracture evaluation in a geopressured reservoir
Frequently, it is seen that production rate and flowing tubing pressure decline rapidly on abnormally pressured wells following a hydraulic fracture stimulation. It is often thought that rapid decline in production rate is due to inadequate fracture characteristics. However, the rate of decline depends on many factors, such as formation permeability, fracture half-length, fracture conductivity, reservoir pressure and reservoir size. Also on deep, low-permeability, high-pressure wells, closure stress can play an important role on the rate of decline in production when large rapid pressure drawdown is required for economic production rates. This paper utilizes pressure transient test data and production data to evaluate a hydraulically fractured well in a geopressured reservoir. A prefracture buildup test, type-curve techniques for fractured wells with boundary effect, and a two-dimensional, single-phase simulation program with closure stress on proppant are used to arrive at an explanation for the performance of a well. It was found that a small reservoir drainage area and a loss of fracture conductivity were major factors of rapid decline in productivity. Projections on future well performance were made and compared with subsequent actual well performance.
- Research Organization:
- Dowell Schlumberger
- OSTI ID:
- 5356837
- Journal Information:
- Soc. Pet. Eng. AIME, Pap.; (United States), Journal Name: Soc. Pet. Eng. AIME, Pap.; (United States) Vol. SPE13816; ISSN SEAPA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
020300* -- Petroleum-- Drilling & Production
03 NATURAL GAS
030900 -- Natural Gas-- Artificial Stimulation
Plowshare-- (-1989)
COMMINUTION
COMPUTERIZED SIMULATION
ENERGY SYSTEMS
ENGINEERING
FRACTURING
GEOPRESSURED SYSTEMS
HYDRAULIC CONDUCTIVITY
HYDRAULIC FRACTURING
NATURAL GAS WELLS
OIL WELLS
PERFORMANCE
PRESSURE GRADIENTS
RESERVOIR ENGINEERING
RESERVOIR PRESSURE
SIMULATION
STIMULATION
WELL PRESSURE
WELL STIMULATION
WELLS