Gas Well Stimulation Increases Production and Profits
- Paul Clinkenbeard (Dowell Inc.) | J.F. Bozeman (Dowell Inc.) | R.D. Davidson (Dowell Inc.)
- Document ID
- Society of Petroleum Engineers
- Journal of Petroleum Technology
- Publication Date
- November 1958
- Document Type
- Journal Paper
- 21 - 24
- 1958. Original copyright American Institute of Mining, Metallurgical, and Petroleum Engineers, Inc. Copyright has expired.
- 3.2.4 Acidising, 4.1.5 Processing Equipment, 3.2.5 Produced Sand / Solids Management and Control, 2.2.2 Perforating, 2.4.3 Sand/Solids Control, 4.1.2 Separation and Treating, 3 Production and Well Operations, 2.5.2 Fracturing Materials (Fluids, Proppant), 4.6 Natural Gas
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Various acidizing and fracturing techniques have been developed to meet gas well stimulation problems. Case histories from four major gas producing areas show that considering such problems on an individual well basis, in light of previous experience in the area, allows planning each stimulation treatment for maximum effectiveness. Despite the common opinion that stimulating old gas wells is unprofitable, results show that stimulating such wells has often resulted in substantial and profitable production increases.
Basic Stimulation Methods
Gas producers have used many variations of the basic stimulation methods, acidizing and fracturing, to obtain maximum production from gas wells. These various techniques are necessary to meet individual well conditions found in different formations and fields. A knowledge of the various stimulation techniques available and of the advantages of each should enable an operator to plan gas well stimulation treatments that will bring maximum production from either old or new gas wells.
Acidizing treatments using inhibited hydrochloric acid to enlarge pores and flow channels have been used successfully for many years. Ordinarily, an acid treatment is conducted by spotting acid opposite the zone to be treated, and then pumping it into the formation.
High-injection-rate acid treatments are a variation of the normal acid treatment. In such treatments, large volumes of acid are injected into the formation at from 15 to 75 bbl/min. Acid is usually pumped down both tubing and casing. Advantages of this technique are that the rapid injection rate penetrates deeper into the formation and breaks down a larger vertical extent of the pay zone.
A special acid is often used to achieve deeper penetration. This acid contains an additive which retards the acid's reaction rate on portions of the formation already contacted. However, the acid reacts rapidly with new, untouched formation rock. This retarded acid is especially valuable in formations which are highly acid-soluble because it penetrates far into the formation before becoming spent. By contrast, normal hydrochloric acid reacts rapidly in such a formation, quickly becoming spent in the immediate vicinity of the wellbore.
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