What Does Acid Bottle Technique Mean?
The acid bottle technique is one of the earliest methods used to measure the angle of inclination of a vertical borehole. This method involved lowering a 4-ounce soda lime bottle half-filled with hydrofluoric acid into the borehole. After about half an hour, the acid would etch a horizontal line on the bottle, which would then be used to measure the inclination angle upon retrieval.
The acid bottle technique is also known as an acid-dip survey.
Trenchlesspedia Explains Acid Bottle Technique
The acid bottle technique was first developed in the 1800s but did not become popularized for borehole measurements until the 1920s. The acid bottle technique, although effective for measuring the amount of deviation from the vertical alignment, is unable to give the cardinal direction of the deviation.
Another weakness of the acid bottle technique is that the tool is only capable of taking one measurement each time it is inserted into the well. For this reason, this method is referred to as a “single shot” technique.
The acid bottle technique has now mainly been replaced by mechanical drift recorders such as the Totco barrel.