Schlumberger

Case Study: Jack Well Test Uses Efficient Real-Time Data Analysis

Unique data collection and storage system cuts days from testing operations schedule for Chevron in deepwater GOM

Challenge: Collect, store, transmit, and evaluate an unprecedented amount of data from the Jack well testing operations in deepwater Gulf of Mexico.

Solution: Capture and store massive quantity of data for real-time analysis using

  • two IRDV intelligent remote dual valves
  • SenTREE subsea test tree
  • DART well testing data acquisition, reporting, and real-time transmission system
  • 25,000-psi permanent gauge
  • PhaseTester portable multiphase well testing equipment with Vx multiphase well testing technology

Result: Performed and evaluated real-time analysis; made decisions that assured all objectives were met in under 49 days.

First ever long-term flow test in the Gulf of Mexico

Chevron announced discovery of the Jack prospect in September 2004. It is approximately 270 mi southwest of New Orleans and 175 mi offshore. Chevron needed to successfully collect, store, transmit, and evaluate an unprecedented amount of data from the Jack well testing operations. The test length was scheduled for approximately 60 d, which was considered necessary to better understand the aerial extent of the reservoirs across the Walker Ridge trend and help determine the reservoir characteristics.

Because of prior positive experience on the Tahiti well in 2004, Chevron came to Schlumberger first for a solution. The Schlumberger team was able to design a system that would function effectively throughout both flow periods and shut-in periods for the required duration. Chevron was an active part of the process in defining the specifications and scope of the project.

Seven weeks of continuous well test operations

Schlumberger used a unique combination of tools to capture and store this massive quantity of data for real-time analysis. Included were a multiphase surface well testing package and all required downhole components: two IRDV dual valves, the SenTREE HP subsea test tree, 25,000 memory gauge recorders, the DART data acquisition, reporting, and transmission system, a 25,000-psi permanent gauge, and PhaseTester equipment with Vx technology.

Special conditions required unique creativity. The DART system had to be enhanced to provide data integration and transmission for such an extended duration. It was critical that every component be guaranteed for optimum, continuous data management. PhaseTester equipment was utilized as the primary measurement device for flow rates during the well test. In addition, use of IRDV dual valves lowered operating pressures and allowed the rupture disc settings to be spaced out on all the accessory tools.


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