Tubingless Completions: A Review of Equipment, Economics and Techniques

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Abstract
The economic advantages in completions utilizing 2%-in. tubing as casing are, generally speaking, quite obvious. In today's atmosphere of rising costs and increased competition, this completion method is being viewed with interest by practically every operating company. The number of completions actually made has increased greatly in the past year. It will increase even more when companies not now experienced with this type of completion are made aware of the methods successfully being utilized and the equipment being made available. Companies interested in starting a program of tubingless completions are naturally concerned with the results which have been achieved in the past. They are also concerned with the difficulties that have been encountered. They want to know the savings that actually have been made in these completions and, also, what possible ultimate savings are now predicted. They want to know which methods and equipment have been tried and which have proved most successful. Also, they want to know what major problems still are unsolved and what limitations are becoming apparent. In a rapidly developing technological change such as this, periodic reports are necessary to keep the industry advised of the progress made. This paper attempts to report the latest equipment, how it is being utilized, and what problem areas are evident. Introduction: To date, most of the work done in the United States in tubingless completions has been performed in relatively shallow areas where production could adequately be handled by the 2%-in. casing. These areas are Southwest Texas, West Texas, the Texas Panhandle, Kansas and Oklahoma. Many companies in these areas were contacted for information concerning the methods and equipment which were being utilized most successfully and, also, concerning the general economic results obtained. This permits the presentation of a wider scope of information than would a review of one company's results and methods in one area only; however, it presents somewhat of a reporting handicap because the information obtained must be discussed in general, rather than specific, terms.

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