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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.
Grammar Handbook: Restrictive and Nonrestrictive Clauses. A modifying clause can be either restrictive or nonrestrictive. Restrictive Clause. A restrictive modifying clause (or essential clause) is an adjective clause that is essential to the meaning of a sentence because it limits the thing it refers to. The meaning of the sentence would change if the clause were deleted. Because restrictive clauses are essential, they are not set off by commas.