A New Tool for Perforating Casing Below Tubing
- Blake M. Caldwell (Welex Jet Services Inc.) | Harrold D. Owen (Welex Jet Services Inc.)
- Document ID
- Society of Petroleum Engineers
- Journal of Petroleum Technology
- Publication Date
- December 1954
- Document Type
- Journal Paper
- 29 - 36
- 1954. Original copyright American Institute of Mining, Metallurgical, and Petroleum Engineers, Inc. Copyright has expired.
- 3 Production and Well Operations, 1.14 Casing and Cementing, 2.2.2 Perforating, 4.3.4 Scale, 2 Well Completion, 2.4.3 Sand/Solids Control
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The continued use of permanent-type well completion has pointed up the need for more powerful through-tubing perforating equipment. A new expendable shaped charge perforator has been developed in which the charges are run through the tubing in a vertical position and then opened out to a horizontal position when at the desired shooting zone. The performance of this new tool is comparable to that of conventional casing type perforators.
This paper describes the new tool and its applications. Performance data in targets and under various actual well conditions are presented.
The general acceptance and increasing use of permanent-type well completion by the oil industry has indicated the need for through-tubing perforating equipment with performance comparable to that of conventional casing type perforators. To achieve the performance desired, a new, expendable, shaped charge perforator has been developed with adequate power for effectively perforating both 51/2 -in. and 7-in. casing below tubing. This has been accomplished without resulting severe damage to the casing and can be obtained under extremes of pressure and temperature. The design of this new tool is a radical departure from previous concepts of tubing guns since it was felt that the two major limitations imposed by previous designs severely handicapped performance.
The first of these limitations was the restriction imposed upon the length of the charges by the necessary small inside diameter of the carrier. This resulted from the necessity for compromises in designing a hermetically sealed gun small enough to allow free passage through 2-in. tubing, yet with sufficient wall thickness to withstand some minimum pressure. In an effort to overcome this limitation, the charges were in some cases placed at an angle with the axis of the well with resulting loss in effective depth of penetration.
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