In the oil industry measured depth (commonly referred to as MD, or just the depth), is the length of the borehole. In conventional vertical wells, this conincides with the true vertical depth, but in directional or horizontal wells, especially those using extended reach drilling, the two can deviate greatly. For example, at the time of writing (2012) a borehole in Odoptu field, Sakhalin-I, has the greatest measured depth of any borehole at 12,345 m, but most of this is horizontal, giving it a true vertical depth of only 1,784 m. For comparison, the Kola Superdeep Borehole has a slightly shorter measured depth at 12,262 m, but since this is a vertical borehole, this is also equal to the true vertical depth, making the Kola Superdeep Borehole deeper by a factor of 6.9.
Famous quotes containing the words measured and/or depth:
“The advantage of living is not measured by length, but by use; some people have lived long, and lived little; attend to it while you are in it. It lies in your will, not in the number of years, for you to have lived enough.”
—Michel de Montaigne (1533–1592)
“From the depth of the dreamydecline of the dawn through a notable
nimbus of nebulous noonshine,”
—A.C. (Algernon Charles)