Sec. 151.324. EQUIPMENT USED ELSEWHERE FOR MINERAL EXPLORATION OR PRODUCTION. (a) The following items are exempted from the sales tax imposed by Subchapter C of this chapter:(1) drill pipe, casing, tubing, and other pipe used for the exploration for or production of oil, gas, sulphur, or other minerals offshore not in this state; and(2) tangible personal property exclusively used for the exp