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CASED-HOLE TESTING In cased hole testing a retrievable production packer is set above the zone of interest, and the well is flow tested through perforations in the casing. Mechanical In a mechanical cased hole test, the operator has determined from core samples and logs exactly where the casing has been perforated. The packer is positioned appropriately on the drillstem and the tools lowered into the cased hole. Placing weight on the tool string opens the hydraulic valve allowing the formation to flow into the tool and rise to the surface. The formation is flowed for a specified time period, after which weight is removed from the tool string closing the hydraulic valve for a specified shut-in period. Measuring flows and shut-ins with this procedure can be performed as many times as are deemed necessary. Annular These tools and techniques can be used on high pressure, high temperature, and high volume wells on land and offshore. The annulus pressure operated system of testing tools has been used offshore for years primarily because of its ability to compensate for wave motion. This operating method allows a drillstem test to be conducted with a closed system, where the rams are closed during the test, and no pipe rotation or manipulation is necessary to control the test. Annular tools are full bore (2.25 inch ID), which minimizes flow restrictions, and allows for the incorporation of perforating guns in the tool string. The perforating guns can be activated via TCP or Wireline operation. Annular testing tools also allow for unlimited flow and shut-in cycles. |
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