Here's what could take oil down to $30

A worker walks at Nahr Bin Umar oil field, Iraq, Nov. 23, 2014.
Essam Al-Sudani | Reuters

A seasonal event that happens every year may be what finally pushes oil prices to rock bottom.

West Texas Intermediate crude futures broke below their 2015 low this week and are trading around $42, a more-than-six-year low. The bottom in this market has been elusive, with Wall Street targets consistent in that they have been missing the mark, as oil plunged into the $40s after roaring back to the $60s in a head fake rally during the spring.

Now, the next mile marker for the futures market appears to be on the downside, with oil heading toward the $40-per-barrel level. Many traders then expect to see prices settle somewhere in the $30s before a bottom is reached.