Pressure Transient Analysis
Well testing of oil and gas wells is performed at all stages of construction, completion and operation. The objectives of well testing vary at each stage, from determining fluid type and reservoir performance to determining the parameters of a composite reservoir bed. Most tests can be grouped into two categories: steady-state test and transient test.
Steady-state test
- Pressure test
- Tracing IPR curve
Transient test
- Surveys on pressure drawdown curve
- Surveys on pressure build-up curve
- Multi Rate Studies
- Hydrotest
- Slug test
The data obtained during well testing form the basis for analysis, prediction and planning of enhanced oil recovery measures, which, in turn, are vital for optimizing development and improving the efficiency of enterprise operations management.
Hydrodynamic surveys in terms of technical and practical purposes are subdivided as follows:
Technical objectives of research:
- Determining the productivity and behavior characteristics of the wells tested;
- Determination of reservoir properties, the following parameters: pressure, temperature, permeability, skin;
- Determination of reservoir boundaries, estimation of its reserves;
- Determination of the nature of reservoir saturation, properties of reservoir fluids;
- Determination of the type of hydrocarbon to be produced;
- Determination of the flow rate of the well;
- Sampling of fluids for recombination (PVT) and fluid samples for general analysis.
Practical objectives of testing:
- Conduct well testing safely and efficiently without causing harm to personnel, the environment, and equipment;
- Conduct testing in accordance with international industry standards, company procedures and applicable laws of the Republic of Kazakhstan;
- Not to allow for any additional RIH/POOH (in case of downhole equipment failure) when running DST, perforators and samplers;
- Conduct testing without spills of hydrocarbons in the environment, as well as uncontrolled release of hydrocarbons;
- Achieve the project's technical objectives in accordance with the established timeframes. Pay particular attention to the quality of data provided (collected, calculated, verified and reported) and the quality and representativeness of fluid samples;
- Timelyprovide a detailed well test report.