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LEGALLY â a vertical pugh clause is one where all acreage outside of the well/unit boundaries must be released. LEGALLY â a horizonal pugh clause is one where you must release acreage below a certain depth. However, these two terms are used interchangeably in the industry. The way I teach my studends is this, if you warp your arms around the unit and chop down (vertically) then it is a vertical pugh clause.
What is a Grandfather Clause. A grandfather clause is a provision in which businesses, enterprises, or class of persons are exempt from the provisions of a new rule, regulation, or law. Usually, a grandfather clause specifies a date for the division of exempted entities, making it clear that situations that occur from that date forward are subject to the new regulations. In basic terms, a grandfather clause allows the current state of something to remain unchanged, regardless of the policy change.