Joeny Well Services Ltd

DST Drill Stem testing

Drillstem Testing (DST) is a valuable tool in the oil and gas extraction process used for accurate evaluation of the formation conditions. Joeny Well Services Limited have years of experience solving clients problems with innovative Drillstem testing services to determine the productive capacity, pressure of an oil or gas reservoir.


A perforation in the context of oil wells refers to a hole punched in the casing or liner of an oil wells to connect it to the reservoir In cased hole completions, the well will be drilled down past the section of the formation desired for production and will have casing or a liner run in separating the formation from the well bore. The final stage of the completion will involve running in perforating guns, a string of shaped charges, down to the desired depth and firing them to perforate the casing or liner.

Surface Well Testing

We provide a wide array of surface well testing services. Due to our innovation and the availability of the required equipments, we are able to deliver accurate results that gives you the confidence in the ability of your wells to produce to the required capacity without failure. Our well testing can be grouped into 2; productivity testing or descriptive testing.

Productivity well tests are conducted to:

1. Identify produced fluids and determine their respective volume ratios

2. Measure reservoir pressure and temperature

3. Obtain samples suitable for pressure-volume-temperature (PVT) analysis

4. Determine well deliverability

5. Evaluate completion efficiency

6. Characterize well damage

7. Evaluate work over or stimulation treatment

Descriptive tests seek to:

1. Evaluate reservoir parameters

2. Characterize reservoir heterogeneities

3. Assess reservoir extent and geometry

4. Determine hydraulic communication between wells.

Whatever the objectives, well test data are essential for the analysis, prediction and improvement of reservoir performance. These in turn are vital to optimizing reservoir development and efficient asset management. Integration with data from other reservoir-related disciplines, constant evolution of interactive software for transient analysis, improvements in downhole sensors and better control of the downhole environment have all significantly increased the importance and capabilities of well testing.