Well perforating apparatus and method
AssigneeJames R. Duzan
InventorsMichael L. Oestreich, Norman S. Pollard
Life of this patent
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Abstract
A perforating gun is designed to have explosive charges spirally disposed around its circumference in accordance with a displacement angle defined as (m/p)(360.degree.), where p is a whole number greater than 4 and m is a whole number greater than 1 but less than (p-1) and where m/p is an irreducible fraction. A U, or horseshoe, shaped retainer clip holds individual charges in respective holes and cavities of an outer carrier tube and an inner carrier tube to prevent horizontal or transverse movement of each charge and thereby hold it in contact with an axially extending detonator cord.
Claims14
A perforating apparatus, comprising:
- a perforating gun body;
- and
- carrier means, disposed in said perforating gun body, for carrying at least p explosive charges so that, when explosive charges are carried thereby, each successive explosive charge is laterally spaced from a preceding one by an angle (m/p)(360.degree.), where p is a whole number greater than 4 and m is a whole number greater than 1 but less than (p-1), and where m/p is an irreducible fraction, said carrier means including:
- an outer charge holder tube having a plurality of holes defined therein in accordance with said angle so that each of said holes is disposed for having a discharge end of an explosive charge facing radially outwardly therethrough;
- and
- an inner charge holder tube disposed axially through said outer charge holder tube, said inner charge holder tube having a plurality of cavities defined therein, each of said cavities aligned with a respective one of said holes of said outer charge holder tube so that each of said cavities is disposed for receiving an initiation end of an explosive charge near a center line of said perforating gun body.
A perforating apparatus, comprising:
- a perforating gun body;
- and
- carrier means, disposed in said perforating gun body, for carrying a plurality of explosive charges, said carrier means including:
- an outer charge holder tube having a plurality of holes defined therein so that each of said holes is disposed for having a discharge end of an explosive charge facing radially outwardly therethrough;
- and
- an inner charge holder tube disposed axially through said outer charge holder tube, said inner charge holder tube including a plurality of cavities defined therein, each of said cavities aligned with a respective one of said holes of said outer charge holder tube so that each of said cavities is disposed for receiving an initiation end of an explosive charge near a center line of said perforating gun body.
Dependencies are inferred from the claim text.