Patent ID: 6089526
Filing Date: 2000-07-18
Classification: E21B

Abstract:
A blowout preventor, comprising:a housing with a bore therethrough and opposed guideways extending from the bore,a pair of rams each comprising a metal body slidable within a guideway toward and away from the ram in the other guideway and having a slot across its front face intersected by a vertical recess, anda pair of ram packers each comprisinga body of elastomeric material fitting closely within the slot in a ram body and having a vertical recess in its inner end symmetrical with and protruding from the recess in the ram body, so that the recesses in both close about a pipe in the bore of the housing as the ram move inwardly to closed position,metal plates embedded in the top and bottom surfaces of the packer body and each having a vertical recess therein generally symmetrical with the recess in the face of the packer body, andfirst and second sets of radially extending metal segments embedded within the packer body below only the top metal plate with their front edges forming a vertical recess generally symmetrical with and radially inwardly of the recess in the top metal plate but outwardly of the recess in the packer body,the segments of each set having generally radially extending side edges circumferentially spaced from one another and overlapping those of adjacent segments of the other set, when the packer body is in its relaxed condition, so as to prevent the formation of gaps through which the elastomeric material might extrude as the packer body is distorted upon closure of the recesses in the elastomeric packer bodies upon a range of pipe diameters greater as well as less than that of the diameter of the recess in the relaxed ram packer body.