Drill Stem Inspection

Drill Stem Inspection

Depending on how severe the working condition/environment is, in terms of erosion and corrosion on one side, and high loads which are normally being applied on the drill string to proceed to buttonhole of the well on the other side, the formation of the flaws on drill string component are likely to occur. Thus, since the failure of the drilling string components during drilling process could be a waste of time and money, tubular inspection of the used drill string is highly recommended. Considering the variety of drilling environment in terms of Land or Sea beside the geology where the well is being drilled which directly makes the cost of a possible failure very high, the stricter scope of inspection according to related standards is applied. Third Vol. of DS-1 (Drill Stem Inspection) published by T H Hill Associates, Inc, is one of the most applicable standards introducing a different level of strictness as per client’s request from Category 1 to Category 5.

Description

Drill Stem Inspection

Drill stem testing is an oil and gas exploration procedure to isolate, stimulate and flow a downhole formation to determine the fluids present and the rate at which they can be produced.

The main objective of a DST is to evaluate the commercial viability of a zone’s economic potential by identifying productive capacity, pressure, permeability or extent of an oil or gas reservoir.

These tests can be performed in both open and cased hole environments and provide exploration teams with valuable information about the nature of the reservoir.

Drill stem testing involves deploying a series of tools known as a test bottom hole assembly (BHA). 

Drill String: on a drilling rig is a column, or string, of drill pipe that transmits drilling fluid (via the mud pumps) and torque (via the kelly drive or top drive) to the drill bit. The term is loosely applied to the assembled collection of the drill pipe, drill collars, tools and drill bit. The drill string is hollow so that drilling fluid can be pumped down through it and circulated back up the annulus (the void between the drill string and the casing/open hole).

References wiki

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