DASS Well- A New Concept of Multiple Zone Well Completion

Over the years, several techniques for multiple zone well completions were evolved in oil industry but due to some or other reasons the popularity of multiple zone well completions lost. Earlier attempts for multiple zone completions were to use multiple tubing or commingling large number reservoirs. Now a new concept of well completion is available in which all the advantages of multiple tubing completions and commingle production can be retained with a single tubing well completions.

The name of the concept well is DASS well. DASS well stands for Dynamically Activated Super Solution wells. The well architecture is radically different from existing well completions. The reservoir fluid enters the well bore through a production chamber. Production chamber is one device which is set over perforations. Multiple production chambers can be installed in a well depending upon the number of zones available for production. A multiphase flow meter and fluid flow control valve are fitted in the production chamber which is operated from surface control panel. The well fluid is flowed from production chamber through control valve to the well bore. The well depth depends upon the expected fluid production rate. A down hole pump is installed to pump the liquid through tubing and gas is produced through annulus in such a way that surface separation minimized/eliminated.

In this paper, the author introduces "DASS well" - the new concept of multiple zone well completion with detailed description and diagram with its advantages and disadvantages.

Deepwater development demands a simple and cheap well completion technology which can help in efficient production, handling, storage and transportation of oil and gas in addition enhancing oil production through advance processes. DASS WELL-the new concept for multiple zone well completion can prove helpful in this direction.