Okla. Stat. tit. 52, § 52-240

prohibited - Regulation of purchases.

Every person, firm or corporation, now or hereafter engaged in

the business of purchasing and selling natural gas in this state,

shall be a common purchaser thereof, and shall purchase all of the

natural gas which may be offered for sale, and which may reasonably

be reached by its trunk lines, or gathering lines without

discrimination in favor of one producer as against another, or in

favor of any one source of supply as against another save as

authorized by the Corporation Commission after due notice and

hearing; but if any such person, firm or corporation, shall be

unable to purchase all the gas so offered, then it shall purchase

natural gas from each producer ratably. It shall be unlawful for

any such common purchaser to discriminate between like grades and

pressures of natural gas, or in favor of its own production, or of

production in which it may be directly or indirectly interested,

either in whole or in part, but for the purpose of prorating the

natural gas to be marketed, such production shall be treated in like

manner as that of any other producer or person, and shall be taken

only in the ratable proportion that such production bears to the

total production available for marketing. The Corporation

Commission shall have authority to make regulations for the

delivery, metering and equitable purchasing and taking of all such

gas and shall have authority to relieve any such common purchaser,

after due notice and hearing, from the duty of purchasing gas of an

inferior quality or grade.