... of acidizing is outlined in this paper. The method to determine segment length and position and treatment parameters are presented for segment acidizing. The three-dimension unsteady acid flow model, acid flow heat exchange model and acid-rock reaction model are established and a semi-numerical calculating...

... Abstract Hydrocarbon bearing carbonate zones are prevalent in Western Canada. Typically, these carbonates are treated with strong mineral or organic acids to clean up or stimulate the formation in either a matrix squeeze or hydraulic fracturing type treatment. In many of these formations...

... Abstract Acidizing deviated wells is a technical challenge because the primary cementing is not always of high quality. Large communicating channels can develop behind the casing. Under such conditions, conventional selective acidizing is ineffective since the acid leaks off...

... Abstract Well stimulation treatments require adequate cleaning of the tubular prior to pumping any stimulation fluids. Current known methods of designing an iron scale removal tube clean treatment employ a. "Rule of Thumb" approach for estimating a sufficient volume of acid and the pump rates...

... Abstract Matrix acidizing is the most commonly used stimulation method for carbonate reservoirs. Many studies have already been done to predict acidization patterns. However, most of these studies focus on chemical reaction kinetics. In this study, core was acidized using conditions similar...

... Abstract Matrix acid stimulations with hydrochloric acid have been instrumental in maximizing the production of crude oil from the Bonnie Glen D-3A Pool since 1951. This type of acid treatment has been the main source of reservoir stimulation for this pool. However, changing reservoir...

... Abstract This paper describes the mechanics and operation of a new selective acid washing tool and its application in successfully stimulating the Arcs member of the Nisku formation in the Youngstown Field of Alberta. Case histories and recommendations are provided as to the wide ranging...

... Abstract Several disturbing results have been observed during recent studies into the compatibility of iron-contaminated acid with conventional additives and formation crudes. Along with the traditional problems of gellatinous iron hydroxide precipitation on acid spending, several additional...

..., "crosslinked" acid gel system using high strength hydrochloric acid has been successfully employed in treating several of these wells. Fracture acidizing treatments have been successfully performed in the D-1 zone at Crossfield, the Pekisko limestone at Twinning, The Slave Point zone at Lubicon...

... Abstract Acid corrosion inhibitors provide protection by adsorbing on metal surfaces, thus forming a barrieragainst acid attack. Upon entering the formation, the inhibitor is strongly adsorbed on clays and other mineral s present within the matrix of the rock. In some cases, inhibitors contain...

... Abstract In the reaction of formation rock with acid, as in a matrix acidizing treatment, varying quantities of insoluble fines are released or otherwise dislocated by the flow. Normal reservoir flow can also cause the breaking or dislodging of fragile clays and minerals present in the pore...

... Abstract Fracture stimulations with foamed acid have een instrumental in significantly improving the producing rates of gas well is in the crossfield D-1 formation. Because of improved clean-ups after the treatment, well stimulations with foamed acids tend to give better results than...

... Abstract A new chemical treatment has been developed to stimulate problem sandstone formations. This treatment is designed to overcome a commonly observed problem in which wells initially respond to matrix acidizing but show rapid production declines following treatment. These rapid declines...

... Abstract Matrix acidization has long been an important completion and stimulation tool. This paper discusses underlying concepts, treatment techniques, and results of acidizing both carbonates and sandstones. Introduction Acidization has been a useful process in initiating and promoting...

... Abstract Well stimulation with acid has from its conception in 1895, been conducted almost as a black art. Through the years, many developments have helped to make it more of a science. In just the last few years, research reported from several areas has advanced the science of acidizing...

... Abstract While acidizing has been an accepted and successful method of well stimulation for four decades, only recently has a truly engineered approach to acidizing begun to develop. Although most of thebasic data involved in acid treatment design still hold true, time and experience have...