Drill Stem Testing

Formation evaluation is critical in making casing point decisions, managing reservoirs and proving reserves. Drill Stem Testing delivers a precise and accurate method to obtain flow and pressure data to support or supplement log data.

If present, hydrocarbons are produced during a DST, proving reserves that would otherwise be classified as probable.

Drill Stem Testing costs significantly less than production testing, making it suitable for proving marginal reserves. And if the reserves aren’t there, you avoid the cost of completing the well to test a questionable zone.

FarleyRiggs delivers high levels of success through investment in personnel and high quality equipment. It is our commitment to always deliver high levels of service quality in all areas of our business.

Ancillary Testing Services

We have invested in state of the art injection pumps specifically designed for injectivity fall off testing. These state of the art injection pumps have the capability to pump at rates of 750 bbls/d with a surface pump pressure of 3,000 psi. The pump is supplied with a calibrated data acquisition package that will supply surface pressure and flow rate data. This data can be merged with down hole gauge data, and subsequent analysis can determine the magnitude of the skin and the permeability of the reservoir in the area around the well bore.

DST Wireless Real-Time Telemetry

Introduction

Drill Stem Testing methods are regularly used to acquire data to help determine if a reservoir may be commercially viable during the drilling phase of exploration project.

Formation pressure, flow rate, fluid type, permeability, skin damage and radius of investigation can be determined from data acquired during the test. These calculations are only possible if the test is of sufficient duration to acquire adequate Horner data. However, because these tests are often evaluated using only memory tools located at or near the sand face, formation tests are often cut short before enough data is available for a meaningful extrapolation.

The advent of Electromagnetic Wireless Telemetry tools delivers the added benefit of being able to determine when a test is of sufficient length to achieve an appropriate Horner extrapolation. The test is then conducted for the minimum appropriate test period and the results of the evaluation are optimized.

Theory

Wireless Electromagnetic is a method by which electronic transducers measure formation pressure and then pulse the data to surface via electromagnetic waves through the formation strata. At surface, a grounding rod in the earth combined with a passive electrical connector at the wellhead provides the signal path to receive and decode the incoming EM pulse. Backup memory tools in the EM Carrier provide parallel reference results that are more densely populated for in depth reservoir analysis.

Remote Real Time Data Acquisition

One of the biggest challenges that currently face many client organisations is the availability of personnel resources. To help clients overcome this challenge RDA or Remote Data Access was developed. The RDA capability allows data to be streamed from remote field locations to client desktops eliminating the need for Engineers to be present on location. This development allows clients to have a degree of flexibility when planning personnel requirements for future operations.

Wireless Telemetry Tool Specification

Maximum Pressure:	20,000 psi
Accuracy:	0.1% Full Scale
Temperature Range:	150°C
Sample Frequency:	1 sample/56 secs
Tool Diameter:	5.0 inch