Services

SERVICES

•     Open Hole Conventional Straddle & Bottom Hole
•     Open Hole Inflate Straddle & Bottom Hole
•     Cased Hole        
•     Conventional Coring
•     Slimhole Conventional Straddle &   Bottom Hole
•     Closed Chamber Testing
•     Diagnostic Fracture Injectivity Testing
•     Injection Fall Off Testing
•     Real-Time Well Data by Telemetry

Drillstem Testing

Drillstem Testing (DST) is a valuable tool in the oil and natural gas extraction process. Drillstem Testing is a procedure to determine the productive capacity, pressure, permeability or extent of an oil or gas reservoir. Drill stem testing is essentially a flow test, which is performed on isolated formations of interest to determine the fluids present and the rate at which they can be produced. By employing parts such as a DST bottom hole assemblies (BHA) application tests can be done to determine the viability and commercial productivity of a well within an accelerated time line as well providing lower financial risk compared to conventional well testing methods.

Basic Drill Stem BHA consist of a packer or packers, which act as an expanding plug to be used to isolate sections of the well for the testing process, valves that may be opened or closed from the surface during the test, and recorders used to document pressure during the test. In addition to packers a down hole valve is used to open and close the formation to measure reservoir characteristics such as pressure and temperature which are charted on down hole recorders within the BHA.

Applications of drillstem testing:

Drillstem testing can be performed in both Open & Cased hole wells

Open Hole

Because it's performed before casing is run, open hole drillstem testing can be the most economical way to determine the productivity of an oil or gas reservoir. The testing equipment is run into the well and the zone of interest is isolated using inflate or conventional-set packers, depending on your requirements and drilling conditions.

Cased Hole

Performed after the well is cased – Drillstem Testing uses the same technology as testing in open hole wells. Cased hole testing in the most economical way of re-evaluating old wells or retrieving data from new well where casing has had to be run due to poor well conditions. Both Inflate and Conventional DST Tools can be Run In Hole to isolate perforations in casing to retrieve well data

Inflate

Open hole inflate tests utilize a pair of interval spaced packers which are inflated using annular fluid to isolate the formation of interest. This type of testing is adaptable to a wide range of conditions. Inflate testing is the most time and cost effective method that can be used to isolate multiple formations since multiple zones can be analyzed during a single run in the hole.

Conventional

Open hole compression, or conventional drillstem test uses a compression set packer set above the formation, with tail pipe below the packers to the bottom of the hole. Placing weight on the tool string opens the hydraulic valve allowing the formation to flow into the tool and rise to the surface. The formation is flowed for a specified time period, after which a shut-in valve is rotated to the closed position for a specified shut-in period.

DST Web viewer Live

DST Web viewer Live! Shortens decision times and reduces rig costs by providing real-time data analysis and direct communication between the office and the field. A proprietary system, Web viewer Live! Enables clients to remotely and securely access real-time test results from multiple stations anywhere in the world via satellite link-up. Using DST Web viewer Live!, a DST Australia technician can provide guidance while the tests are being run, and decision makers can communicate securely with the field in the event of a tight hole. They can see the data as it is collected, analyze it, and amend the test parameters to ensure optimal data collection.

You can download the the program driver from our website:

http://www.teamviewer.com/en/index.aspx

Key Features of DST Web Viewer Live•    Live presentation of down hole pressures, & Temperature

Benefits of DST Web Viewer Live

•    View DSTs from your own computer
•    Modify flow and shut in periods based on reservoir response

Closed Chamber Testing

Closed chamber testing enables the calculation of inflow fluid volume as a function of time by monitoring surface pressure. It also allows the measurement of the smallest flow rates with pinpoint accuracy, with flow rate and pressure data are calculated to 1 kPa.

These tests are conducted with the tool string in the hole and the surface valve closed to create a closed chamber of known volume. By eliminating flaring, a closed chamber test offers the additional benefits of added data security, minimized environmental impact, and safety.

Coring

DST Australia has the equipment and trained personnel to cut core onshore.  The conventional core barrels are rugged core recovery tools designed for operation at the bottom of the drill string where a core bit cuts the core, which is effectively collected and retained inside the core barrel. Retrieving the core requires to pull out the hole the entire drill string and then remove the inner tube from the barrel to retrieve the core sample.

The inner and outer tubes are constructed from high tensile cold rolled steel to withstand the most extreme down hole conditions. The inner barrel is connected to a swivel which, in turn, is connected to the safety joint. The swivel contains a bearing assembly with long- wearing, mud lubricated bearings. The bearing assembly permits the inner barrel to remain stationary while the drill string turns the outer barrel, rotating the core bit.. An optional additional bearing assembly located near the bit, maybe used to further ensure proper alignment of the core as it enters into the barrel. The lateral play of the inner tube can be virtually eliminated with optional brass inner barrel stabilizers.
The inner barrel assembly is connected to the outer barrel assembly by means of a safety joint.
In normal operation, the safety joint permits the inner assembly to be pulled out for core recovery at surface. The safety joint also allows removal of the inner barrel and any core that has been cut, should the outer barrel become stuck during the coring operation.

Inner tubes:

Professional Services

DST Australia provides professional services in the areas of DST test planning for companies looking to learn more about past or future DST data or planning strategies.