A Method of Perforating Casing Below Tubing
- M.P. Lebourg (Schlumberger Well Surveying Corp.) | G.R. Hodgson (Schlumberger Well Surveying Corp.)
- Document ID
- Society of Petroleum Engineers
- Journal of Petroleum Technology
- Publication Date
- December 1952
- Document Type
- Journal Paper
- 303 - 310
- 1952. Original copyright American Institute of Mining, Metallurgical, and Petroleum Engineers, Inc. Copyright has expired.
- 1.6 Drilling Operations, 1.10 Drilling Equipment, 3 Production and Well Operations, 2.4.3 Sand/Solids Control, 2.2.2 Perforating, 5.4.2 Gas Injection Methods, 2 Well Completion, 1.14 Casing and Cementing, 1.11 Drilling Fluids and Materials, 4.3.4 Scale
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The introduction in the field of a new type well completion called for the setting of tubing open-ended in the well before perforating the casing. This paper describes a new perforating tool of the shaped charge expendable type, small enough to pass through tubing and powerful enough to perforate the casing. The perforations are produced at an angle and are large enough for optimum production. Performance of this tool in targets and under various well conditions is described.
Very often no lifting equipment will be available at the well. In some cases, pressure will exist in the well at the time of the perforating operation (workover wells or multiple trip perforation); therefore, new equipment and new technique for the perforating operation were devised. This paper describes this equipment and technique, particularly casing collar recording, sheave support, and cable pull-down device, this last item being necessary for wells under pressure. Results obtained with this tool in the field are given.
One of the key requirements for the introduction in the field of a new method of permanent well completion was the development of a new perforating method involving the use of a perforating gun small enough to go through tubing and with enough penetrating power to perforate the casing satisfactorily.
The equipment described in this paper was basically designed to go through open-ended two-in. tubing and to perforate 5?-in. casing. The equipment is illustrated in accompanying figures.
New Completion Method
With the new permanent type well completion, the production string of casing is run and cemented through the potential producing zone. Open-ended tubing is then run into the well and used to replace the drilling fluid with oil or water. The amount of the oil or water "cushion" can be varied according to the expected bottom hole pressure. Thus, if desired, the hydrostatic head can be greater, equal to, or less than the expected pressure within the zone to be perforated.
Mud having been displaced, the tubing is then positioned so that the end is above the zone to be perforated.
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