Pressure Transient Testing and Reservoir Performance Evaluation
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Pressure Transient Testing and Reservoir Performance Evaluation Course
Introduction:
The Reservoir flow capacity and well productivity index can be derived from pressure transient analysis using data acquired during well testing. In the case of exploratory wells, testing rates, as well as bottom-hole pressures, are acquired under a temporary well completion that consists basically of a production tubing and a separator (no flow lines), which may not be the final production system layout for the well.
A simple production system layout consists of wells, flowlines, production manifold, separator, metering instruments just to mention a few and the study of the pressure-rate relationship throughout the system helps in defining the expected value for the well flow rate for a given value of production parameters. All pressure drops from the reservoir, completion, production manifold and flowlines to the final crude storage vessels need to be known at any production time. Flow rate sensibility to different controlling parameters like pipes ID, gas-oil ratio, wellhead, separator and flowline pressures, PVT fluid parameters, water cut should be carried out to understand the impact on final well production rate.
Course Objectives:
The course is delivered in a combination of lecture-style and computer-based training. In addition, a significant amount of time is set aside for small working group activity when addressing case study problems. Extensive use is made of case study material to underline the key aspects of the course and to give the delegates exposure to current best practice.
Who Should Attend?
This program is addressed to professionals working in reservoir and production engineering:-
- Reservoir and petroleum engineers
- Production engineers
- Exploration and development geoscientists
- Well test engineers
Course Outlines:
Pressure Transient Analysis (PTA)
A brief introduction is given to well testing and well test analysis methodology also referred to as Pressure Transient Analysis. Well testing objectives, as well as the type of tests, are presented. Reservoir and well information derived from pressure data analysis are emphasized and the methodology currently used for pressure transient analysis is presented.
- Fluid Flow through porous media. Solutions
- Flow regimens and Interpretation models
- Pressure transient analysis methodology
- Practical and advanced methods(deconvolution)
- Minimum testing time to achieve objectives
- Examples using the software application
Rate Transient Analysis (RTA)
A brief summary is given to traditional decline curve analysis methods. The introduction of material balance time and advanced decline methods of analysis applicable to conventional and non-conventional reservoirs are discussed.
- Reservoir flow capacity determination from transient rate analysis
- Fetckovich, Blasingame and Arps models
- Decline Curve Analysis
- Models currently used; Arps, hyperbolic, exponential and Duong
- Examples using the software application
Production System Performance (Part 1)
The analysis of the production system, considering the impact of pressure drops taking place from the reservoir and through the completion, pipes and production lines, as well as other elements of the system is presented.
- Inflow Performance relationship and well productivity index
- Pressure drop calculation trough production and all components of the system considering the multiphase flow
- Pressure drop through the well completion and VLP (Demand)
- Transient and pseudo-steady-state IPR
- Examples using the software application
Production System Performance (Part 2)
The analysis considering the impact of artificial lift systems (mainly gas lift and ESP pump), as well as other elements of the well completion, in the value of the actual production rate is presented. In addition, a brief summary is given to flow assurance concepts as well as the impact of sand and water production.
- Flow pattern and calculation of pressure transverse
- Gradient curves
- Artificial Lift Systems (gas lift and pump)
- Gravel pack
- Flow assurance
- Sand and water production
- Examples using the software application
Non-conventional Reservoirs
A brief summary is given to the modeling fluid flow behavior in non-conventional reservoirs. Methods for pressure and rate transient analysis applicable to horizontally fractured wells are presented. Decline curve analysis and the uncertainties in pore volume and reserves estimation are discussed.
- Basic reservoir description
- Reservoir and well model. Analytical and numerical solutions
- Well completion; multistage hydraulic fractures
- Present flow regimes and transient rate and pressure analysis
- SRV (stimulated reservoir volume)
- Geomechanics impact on well production
- Examples using the software application
