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AssigneesTong Oil Tools Co., Ltd., Tong Petrotech Inc
InventorsGuoan Zhang, Jianlong Cheng, Xianhong Sun
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This invention provides a structure for gunpowder charge in multi-frac composite perforation devices that is easy to assemble and transport while the charge volume of gunpowder is increased. In one embodiment of the present invention, an triplet outer gunpowder box is attached onto the outer wall of the charge frame and comprises one middle gunpowder box charged with gunpowder of certain burning rate, and two side-hung gunpowder boxes charged with gunpowder of another burning rate. The two side-hung gunpowder boxes are separately located on the two sides of the middle gunpowder box and are connected with the middle gunpowder box as a unit. The middle gunpowder box is located at a position corresponding to the perforating charge, and has an inner groove for orienting the perforating charge and a through hole through which the jet flow passes.
A structure for gunpowder charge for a multi-frac composite perforation device that comprises an inner gunpowder box between adjacent perforating charges in the charge frame 1 of said perforation device, said structure for gunpowder charge comprises a outer gunpowder box 4 attached to the outer wall of the charge frame 1, wherein said outer gunpowder box 4 comprises a middle gunpowder box 3 and two side-hung gunpowder boxes 2A and 2B, wherein said boxes 2A and 2B are separately located on the two sides of said middle gunpowder box 3, and wherein the gunpowders charged in said inner gunpowder box and outer gunpowder box 4 are classified into three types:
Dependencies are inferred from the claim text.