The summary of ‘Drill stem testing’

This summary of the video was created by an AI. It might contain some inaccuracies.

00:00:0000:08:45

The video provides a detailed explanation of the Drill Stem Test (DST) process used in evaluating well production potential. The DST tool, including components like the Packer and hydraulic recorder, is utilized to measure formation pressure, temperature data, and hydrocarbons composition. The well operator seals off the hole with the Packer, monitors annulus pressure, and allows formation fluids to flow into the tool for analysis. The evaluation helps owners understand the well's producing characteristics, determine permeability, and assess formation size. By controlling pressure and fluid flow, the DST aids in decision-making on casing operations and well completion.

00:00:00

In this part of the video, the well operator occasionally orders a drill stem test (DST) for measuring and recording formation pressure, temperature data, and hydrocarbons composition. The DST tool is assembled at the bottom of the drill stem, includes components like a reverse circulation sub, hydraulic recorder, safety joint, and anchor shoe. The tool is lowered to the desired depth in the well to evaluate a selected test zone. The DST helps owners decide whether to run casing and complete the well efficiently by allowing them to understand the well’s producing characteristics. The assembly is lowered into the well after conditioning with drilling fluid.

00:03:00

In this segment of the video, the process of conducting a Drill Stem Test (DST) is explained. The drillers use the Packer to seal off the hole, allowing formation fluids to flow into the DST tool. Crew members monitor annulus pressure to ensure a good seal. A water cushion is added above the DST tool to support the drill pipe and apply pressure on the formation. The water cushion prevents formation fluids from surging into the tool, protecting equipment and the formation rock. After clearing out the drill stem, the crew allows the formation fluids to flow up the tool to the surface.

00:06:00

In this segment of the video, the process of evaluating a well’s production potential and fluid properties using a Drill Stem Test (DST) is explained. After allowing the well to flow for a set time, the shut-in valve is closed to measure the formation pressure buildup. The pressure data recorded helps in determining the permeability and size of the formation. To remove the DST tool from the well, the reverse circulation sub is opened to circulate drilling fluid down the annulus and up the tool. This process removes formation fluids and maintains pressure control. The tool is then pulled out of the hole by releasing the Packer and, if needed, by using a hydraulic jar.

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