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COSL’s “Basic Reservoir Characteristic Tester” or “BASIC-RCT” is a third generation product of the formation tester family, characterized by its pump through function. BASIC RCT is a compact, convenient, safe and efficient tool. It can replace in part Drill Stem Testing (DST) operations in order to save rig time. BASIC RCT provides economical and reliable solutions to formation evaluation for oilfield exploration and engineering, representing a good means to reduce cost while solving difficult technical problems. BASIC RCT can be run on any service company logging unit, requiring only winch, cable head and depth measurement. All services, telemetry, gamma ray recording, test recording (digital, numerical listing, screen and printer graphics) are provided in real time. Tool configurations are shown in Figure 1.14. For latest specifications, the reader should refer to the manufacturer’s updates.

Functions

 Measuring formation pressure accurately

 Taking multi-samples of formation fluids

 Taking large samples

 Pumping through contaminated formation fluids

 Monitoring formation fluid properties in real time.

 Flowing formation fluids at controlled rates

 Pumping through in reverse

 Making quick well site sampler transfer

 Providing real time and reliable data for analyzing permeability and formation damage

Structure

The BASIC RCT is a combination of surface system and downhole tools. The surface system includes the Acquisition and Data Process software, PC and DC control panel, and AC power supply. The downhole tools include the upper electronics section, mechanical/hydraulic section, sensor section, lower electronics section with a standard configuration, and also include the 2 × 520 cc large sampler with optional configuration (see Figures 1.15 and 1.16).

Figure 1.14. Tool string configurations.

Figure 1.15. Tool architecture.

Figure 1.16. Tool and surface system.

Figure 1.17. Pressure drawdown curve (left) and fluid contact curve (right).