(a) Imposition of tax. — For the privilege of engaging or continuing within this state in the business of severing natural gas or oil for sale, profit or commercial use, there is levied and shall be collected from every person exercising the privilege an annual privilege tax at the rate and measure provided in subsection (b) of this section: Provided, That effective for all taxable periods beginning on or after January 1, 2000, there is an exemption from the imposition of the tax provided in this article on the following:

1. (1) Free natural gas provided to any surface owner;
2. (2) natural gas produced from any well which produced an average of less than 5,000 cubic feet of natural gas per day during the calendar year immediately preceding a given taxable period;
3. (3) oil produced from any oil well which produced an average of less than one-half barrel of oil per day during the calendar year immediately preceding a given taxable period; and (4) for a maximum period of 10 years, all natural gas or oil produced from any well which has not produced marketable quantities of natural gas or oil for five consecutive years immediately preceding the year in which a well is placed back into production and thereafter produces marketable quantities of natural gas or oil.

(b) Rate and measure of tax. — The tax imposed in subsection (a) of this section is five percent of the gross value of the natural gas or oil produced by the producer as shown by the gross proceeds derived from the sale thereof by the producer, except as otherwise provided in this article: Provided, That effective for taxable periods beginning on or after January 1, 2020:

1. (1) For all natural gas produced from any well which produced an average in excess of 60,000 cubic feet of natural gas per day during the calendar year immediately preceding a given taxable year, and for oil produced from any well which produced an average in excess of 10 barrels of oil per day, during the calendar year immediately preceding the beginning date of a given taxable year, the rate of tax is five percent of the gross value of the natural gas or oil produced as shown by the gross proceeds derived from the sale thereof by the producer;
2. (2) For all natural gas produced from any well, excluding wells utilizing horizontal drilling techniques targeting shale formations, which produced an average between 5,000 cubic feet of natural gas per day and 60,000 cubic feet of natural gas per day during the calendar year immediately preceding the beginning date of a given taxable year, and for oil produced from any well, excluding wells utilizing horizontal drilling techniques targeting shale formations, which produced an average between one-half barrel per day and 10 barrels per day, during the calendar year immediately preceding the beginning date of a given taxable year, the rate of tax is two and five tenths percent of the gross value of the natural gas or oil produced as shown by the gross proceeds derived from the sale thereof by the producer; and
3. (3) For all natural gas produced from wells utilizing horizontal drilling techniques targeting shale formations, which produced an average between 5,000 cubic feet of natural gas per day and 60,000 cubic feet of natural gas per day during the calendar year immediately preceding the beginning date of a given taxable year, and for oil produced from wells utilizing horizontal drilling techniques targeting shale formations, which produced an average between one-half barrel per day and 10 barrels per day, during the calendar year immediately preceding the beginning date of a given taxable year, the rate of tax is five percent of the gross value of the natural gas or oil produced as shown by the gross proceeds derived from the sale thereof by the producer.