Schlumberger

MDT Forte and MDT Forte-HT Rugged and High-Temperature Modular Formation Dynamics Testers

Modular operational flexibility

It’s the innovative, modular design that makes MDT Forte and MDT Forte-HT rugged and high-temperature modular formation dynamics testers readily customizable for your applications. The MDT Forte and MDT Forte-HT testers are combinable to exactly meet the requirements and goals of any reservoir fluid DFA or sampling program. This designed-in flexibility also makes the testers compatible with almost all Schlumberger measurement technologies and enables quickly evolving the MDT Forte tester as new measurement sensors, techniques, technologies, and options are developed.

Rigorous qualification process and extended reliability testing

The components, electronics boards, and subassemblies of the MDT Forte and MDT Forte-HT testers are subjected to numerous tests conducted at a system level for the entire tool as well as being individually tested. The mission profile of the MDT Forte tester design is quantified, reliable tool operation for 100 h under the full operational and environmental load. The harshest situations that equipment may experience during field operations are simulated, including multiple jarring events. The last step is a lengthy operational test under cycles of temperature, power, functional load, and shock. An extensive database is compiled from this reliability test to define preventive mantenance events, ensuring that the most reliable tool is deployed for each and every job.

Next-generation HPHT Axton gauge

The Axton dynamically compensated single quartz gauge has an operating range to 410 degF [210 degC] and 31,500 psi [217 MPa]. Calibration ensures consistent pressure metrology performance with the same accuracy and resolution expected in standard conditions.

High-temperature InSitu Density sensor

To better manage the challenges of sampling formation fluids from HPHT reservoirs, the MDT Forte-HT tester monitors fluid density to avoid collecting possibly contaminated reservoir fluids. In addition to contamination monitoring, the fluid density measurement can also indicate compositional grading and fluid gradients in high-temperature reservoirs.

High-performance packers

The Dual-Packer Module is engineered for maximum operational efficiency. The asymmetrical packer design reduces the risk of sticking and fishing, and downtime is further reduced through greater durability, longer replacement cycles, and more stations per run. The packers used with the MDT Forte-HT tester are temperature rated to 410 degF [210 degC], and in high-temperature operations, the autoretract mechanism (ARM) minimizes drag and aids recovery after packer deflation. The result is improved reliability during extended testing and sampling jobs.

The two inflatable packer elements that seal against the borehole wall to isolate up to an 11.2-ft interval of the formation, which improves the effectiveness of pressure measurement and fluid sampling in low-permeability, laminated, or fractured formations. Because the isolated area of borehole wall is thousands of times larger than the standard probe area, fluids can be withdrawn at a higher rate without dropping below bubble point. Combined with a probe, the Dual-Packer Module is used to conduct interval pressure transient tests (IPTTs) to determine horizontal and vertical mobilities around the wellbore. Mini drillstem tests (DSTs) conducted with the Dual-Packer Module offer advantages over conventional DSTs, delivering high vertical resolution along the well for characterizing nearby layering and heterogenities. It is environmentally friendly because no fluids flow to the surface, and it is cost effective because many zones can be tested in a short time. The Dual-Packer Module can also be used to create a micro-hydraulic fracture that can be pressure tested to determine the minimum in situ stress magnitude.

Advanced sealing technology

To safeguard sample integrity, the O-ring seals of the MDT Forte-HT tester feature carbon nanotube technology. The engineered structure of the material provides the strength to withstand downhole effects such as temperature degradation and rapid gas decompression during operations. The seals retain their full high-pressure sealing performance even at the low subsea temperatures routinely experienced during deepwater operations, providing sample assurance that is not achievable when using conventional elastomers. This extended sealing performance means that the MDT Forte-HT tester is able to capture and confidently retain high-pressure samples acquired in HPHT wells and deliver undisturbed sample quality for laboratory analysis.

Advanced Pumpout Modules

Improvements to the Pumpout Module increase the effectiveness of fluid acquisition in collecting virtually contamination-free samples. The new mud check valve significantly enhances run time, resistance to plugging, and solids handling. The increased flow area decreases O-ring erosion, limits plugging, and delivers better sand-handling capabilities. The MDT Forte and MDT Forte-HT testers are compatible with Quicksilver Probe focused extraction of pure reservoir fluid for even higher sample purity, with different pump options to ensure maximum performance regardless of reservoir conditions.

Multisample collection

The Multisample Module collects high-quality samples for PVT analysis. Six formation fluid samples, 450-cm3 each, can be retrieved during a single trip into the well. Sample bottles detach easily from the tool for transport to a PVT laboratory. The bottles meet transportation regulations for shipping pressurized vessels, so no wellsite transfer is necessary.

For single-phase sampling, the Multisample Module can be fitted with Single-Phase Multisample Chambers.

Multiple Multisample Modules and Modular Sample Chambers can be combined on the MDT Forte tester, with the total number of sample modules limited only by cable strength and well conditions. For longer toolstrings, as well as operations in highly deviated and horizontal wells, the MDT Forte tester can be deployed on the TLC tough logging conditions system or conveyed with the MaxTRAC downhole wireline tractor system for efficient sampling operations.

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