In the past few years
Completions Engineers have started to take on a more prominent role in well testing. This has been caused by the increased use of the Minifrac or DFIT test as a way to measure
reservoir characteristics. This type of test takes place in the very early stages of completion and may have a direct impact on completions decisions. Completions engineers working in tight gas formations therefore must assume more responsibility for well testing plans.
The list below shows an example of the responsibilities most completions engineers will have.
Modeling completion performance.
Performing stimulation technologies (for example, acidizing, fracturing, water shutoff) based on well and reservoir diagnostics.
Optimizing completion and workover designs and operations.
Designing horizontal and multilateral wells.
Determining primary and remedial cementing procedures along with the design and installation of tubulars, packers, subsurface control and surveillance equipment.
Evaluating and selecting appropriate equipment to achieve completion objectives.
Designing through tubing/concentric workovers and intelligent completions.
Preparing cost estimates & risk in terms of probability and potential remedies.
Importance of Well Testing for Completions
In certain formations, shale gas in particular, the initial completions test may be the only test ever done on a well. The permeability and reservoir pressure calculated during this test will be used to model future well performance and may be used for the entire field. It is important to capture the most accurate test data possible during this test, so that the numbers used in modeling well behavior will give results that can actually be used in forecasting.
Advantages of the SPIDR® system for Completions Engineers
To perform the most efficient well stimulation it is often necessary to learn more about your reservoir before the job starts. The best way to perform this type of test in a tight gas well is to run a Minifrac or DFIT type test. Using the results of this test completions engineers can modify the stimulation plan to get the most efficient frac. The SPIDR® system can also be used to evaluate the effectiveness of a completion. By performing a test before and after a stimulation job, the engineer will be able to evaluate just how effective their fracture was.
The SPIDR® system can also be used to evaluate the effectiveness of cementing jobs. The SPIDR® system can be equipped with up to two external pressure transducers. This allows the SPIDR® system to be used for casing leakage tests, by installing the SPIDR® system connected to both wellhead pressure and casing pressure.