Simplified mathematical technique characterizes gas well flow
To thoroughly define production characteristics of a gas well, flow behavior in both the formation and the production string must be known. Flow through the reservoir is usually described by equations based on the measured values of production rate (Q) and flowing bottom hole pressure (P/sub WF/). However, pressure drop due to flow through the tubing is normally calculated by computer programs calibrated with field data. In both cases P/sub WF/ values must be measured by bottom hole pressure gauges; though in field practice, fast, simplified estimates are often desirable when measured P/sub WF/ values are not available. A new method presented here is useful in such cases and can be applied in both vertical and deviated wells. This method introduces a mathematical technique which provides two equations illustrating the flow characteristics of both the reservoir and the tubing string. The advantage is that data on string geometry, depth, formation productivity, and gas type are not needed because the technique is based on approximations which can often be inserted in the equation of gas flow through tubing. Three couples of (Q,P/sub T/) values, as well as the static bottom hole pressure (P/sub S/) and the static wellhead pressure (P/sub ST/), must be known. Two conditions must prevail: steady-state flow and production of dry gas only. The method has been used with satisfactory results in many wells with a wide range of flow parameters. In addition to production wells, this technique may also be applied to gas injection wells; the procedure is substantially the same.
- Research Organization:
- AGIP, Milan
- OSTI ID:
- 5864302
- Journal Information:
- Oil Gas J.; (United States), Journal Name: Oil Gas J.; (United States) Vol. 84:12; ISSN OIGJA
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
030300* -- Natural Gas-- Drilling
Production
& Processing
DEPTH
DIMENSIONS
DRILL PIPES
DRILLING EQUIPMENT
EQUATIONS
EQUIPMENT
FLOW MODELS
FLUID FLOW
MATHEMATICAL MODELS
MEASURING INSTRUMENTS
NATURAL GAS WELLS
PIPES
PRESSURE DROP
PRESSURE GAGES
PRODUCTION
PROGRAMMING
RESERVOIR PRESSURE
STEADY FLOW
WELL PRESSURE
WELLS